Key Won't Turn in the Lock: What to Do

There are several distinct reasons a key refuses to turn, and identifying which one applies to your situation helps you respond sensibly rather than making things worse. The most frequent culprit on a standard Yale-type nightlatch is a worn or dirty cylinder. Over years of daily use, the internal pins inside the barrel collect grime, dust, and microscopic metal shavings from the key itself. Eventually they no longer align cleanly when the key is inserted, and the cylinder seizes. On uPVC and composite doors — which are common throughout Bexleyheath and the surrounding DA6 and DA7 area — the issue is often a dropped or misaligned door. These doors use a multipoint locking system: when you lift the handle, multiple bolts shoot into the frame simultaneously. If the door has sagged even a few millimetres on its hinges, the bolt or cam positions no longer line up with their keeps in the frame, and the mechanism binds under the tension. The key is not the problem at all; the door alignment is.

A third common cause is a damaged or worn key rather than a faulty lock. Keys develop tiny bends and wear patterns over time, particularly if they have been on a heavy keyring or dropped repeatedly onto hard surfaces. A key that is slightly bent will apply uneven pressure inside the cylinder, causing it to stick part-way through its rotation. Finally, in older properties — and there are plenty of Victorian and Edwardian terraces around Bexleyheath High Street and the streets off Watling Street — a 5-lever mortice deadlock (the type insurers ask you to have, ideally to BS3621) can seize if it has not been lubricated in years, or if the lock case itself has shifted slightly within the door after the timber has swollen or warped with seasonal damp.

If the key is in the lock but will not turn, start with the simplest possible checks. First, make sure you have the correct key — it sounds obvious, but a similar-looking key on the same ring will insert partway into many cylinders before it stops. Second, if you are dealing with a uPVC or composite door, try gently lifting or pushing the door itself while applying light turning pressure to the key. This takes the weight off the multipoint bolts and can release the bind immediately. Do not force the key — apply only the same pressure you would use normally. For a stiff cylinder on a traditional nightlatch or mortice lock, a small amount of dry graphite lubricant or a PTFE-based spray applied around the key and into the keyway can help the pins move freely again. Avoid WD-40 as a first choice; while it frees the key in the short term, it attracts dust and can gum the cylinder up faster over time.

What you should not do is apply sideways force to try to lever the key around, use pliers or a second implement to gain extra torque, or attempt to disassemble the lock yourself. These actions frequently result in a snapped key inside the barrel — which turns a stiff-lock job into a more involved extraction — or a cracked cylinder that then needs full replacement. If the key is already partially snapped, stop completely. Do not attempt to pull the remaining portion out with tweezers or push it further in; leave it in place and call us. Similarly, never attempt to defeat or bypass the lock using any improvised tool. Beyond the obvious security risks, doing so to a lock you do not own (for instance, if you are a tenant locked out Bexleyheath) may put you in a difficult position with your letting agent or landlord.

Once you have ruled out a dropped door or a worn key, the fault usually lies inside the cylinder or lock case — and at that point it helps to understand what your options actually are, because the terms get used loosely. A lock repair means a skilled locksmith investigates and fixes the specific fault: a broken cam, a seized pin, or a misaligned bolt — without replacing the whole unit. A cylinder change (sometimes called a lock change) means swapping out the euro cylinder inside a uPVC or composite door, or the rim cylinder on a Yale-type nightlatch, while keeping the existing hardware in the door. This is usually the quickest fix and is what most people mean when they search for how to change the lock. A full door lock replacement means removing the entire lock case or handle set — necessary when the mechanism itself is cracked, corroded, or has been damaged in a break-in attempt. Installation refers to fitting a lock in a door that has none, or a new lock type where a different one previously sat.

For uPVC and composite doors in Bexleyheath, euro cylinder replacement is by far the most common service we carry out — and it is an opportunity to upgrade to an anti-snap, TS007 3-star rated cylinder at the same time, since standard euro cylinders are vulnerable to the snapping attacks that have been used in burglaries across south-east London. For timber doors with a traditional 5-lever mortice deadlock, the full lock case often needs replacing if it has seized beyond repair or was not British Standard rated to begin with. For Yale-type nightlatches — the spring-loaded rim locks fitted on most older Bexleyheath terraces — a rim cylinder replacement is usually all that is needed. Our team carries all these cylinder types on the van, so the right part is fitted in a single visit. If you are already locked out of your house and wondering what to do, the fastest route back inside is usually calling a professional: we can open the door without damage in most cases, then immediately discuss the repair or replacement with you on the spot.

If the key has stopped working entirely and you cannot get inside, there are a few sensible steps before anything else. Check whether you have a spare key with a trusted neighbour, family member, or — if you rent — your letting agent. Many Bexleyheath letting agents operate emergency out-of-hours lines precisely for this situation. If you are in a block of flats, check whether the communal entrance is accessible and whether a neighbour can let you into the building, even if you then still need help with your own front door. If you have a back door or a ground-floor window that you know is unlocked, consider whether you can reach it safely — but do not attempt to climb or force any entry point, both for your safety and to avoid accidental damage.

If none of those options are open to you and you are genuinely unable to get in, that is what to do when locked out of house: call a professional locksmith rather than trying to force entry yourself. As a 24 hour locksmith Bexleyheath, we take calls at any hour — evenings, weekends, and bank holidays — and we send a locksmith straight away, usually with you in around 30 minutes depending on where in the Bexleyheath area you are. When you call 020 3757 5689, we will confirm an exact up-front price before anyone sets off, based on the type of lock, the time of day, travel distance, and any parts likely needed — so there are no surprises on the doorstep. If you are a tenant, we can work alongside your letting agent and are used to the ownership-verification steps that responsible locksmiths always carry out before opening any property.

A key that has seized once is a warning that the cylinder is nearing the end of its useful life. The practical prevention steps are straightforward: lubricate the cylinder every six to twelve months with a dry graphite or PTFE product, check that your door is hanging squarely and adjust the hinges if it has dropped, and retire any keys that show obvious wear, bending, or distortion. If your uPVC door has a standard euro cylinder without an anti-snap rating, replacing it proactively — before it fails or is targeted — is a worthwhile step. The same applies to older mortice deadlocks: if yours is not stamped BS3621, it may not meet the standard your home insurer requires, and fitting a compliant replacement gives you both security and peace of mind.

For door lock replacement Bexleyheath, our team handles the full range: euro cylinder swaps on uPVC and composite doors, 5-lever mortice deadlock replacements on timber doors, rim cylinder and nightlatch replacements on Yale-style locks, and multipoint lock mechanism replacements where the full gearbox inside a uPVC door has failed. We also carry out upvc door lock repair Bexleyheath for cases where the mechanism is repairable rather than needing a full swap — a split keeps plate, a stiff gearbox, or a handle that no longer lifts the bolts cleanly, for example. For a lock change Bexleyheath after a break-in attempt, a lost key, or a change of tenancy, we can replace and upgrade the lock in a single visit. As an emergency locksmith Bexleyheath, we are on call around the clock, so there is never a need to leave a faulty lock unattended overnight.

Our mobile locksmith covers the full range of residential lock services across Bexleyheath and the surrounding area, from the streets around Bexleyheath town centre to the quieter residential roads near Danson Park. Here is a full picture of what we carry out: euro cylinder replacement on uPVC doors; euro cylinder replacement on composite doors; anti-snap cylinder upgrades; TS007 3-star cylinder installation; 5-lever mortice deadlock replacement; BS3621 mortice deadlock installation; sash lock replacement (combined latch and deadlock in a single case); rim lock replacement; Yale-type nightlatch cylinder replacement; multipoint lock mechanism replacement on uPVC doors; multipoint lock mechanism replacement on composite doors; uPVC door handle replacement; door hinge adjustment and realignment; door frame and keep repair after a lock fault; snapped key extraction; broken key removal from cylinder; cylinder removal where the key has been lost; lock change after a change of tenancy; lock change after a lost or stolen key; temporary lock fitting pending a permanent replacement; communal door lock repair for blocks of flats; additional cylinder fitting for internal security doors; anti-pick cylinder upgrades; anti-drill cylinder upgrades; and lock health checks for insurance compliance. Every job starts with a diagnosis, and we confirm exactly what is needed and what it will cost before we begin.

Because the terminology around door locks can be confusing, here is a plain-language breakdown. A mortice deadlock is the lock whose case sits inside a cut-out (the mortice) in the door edge — you turn the key a full rotation or more and a solid bolt shoots out. Five-lever versions are the standard for timber front doors, and BS3621 is the British Standard rating that most home insurers ask for. A mortice sash lock is the same principle but adds a spring latch alongside the deadlock, so it also handles the door-closing function. Euro cylinders are the barrel-shaped inserts used in the majority of uPVC and composite doors — they are held in by a single central screw and can be swapped in minutes once the door is open, which is why cylinder replacement is such a common service. The weak point of a standard euro cylinder is the section that protrudes beyond the door furniture: burglars can snap it with a specialised tool, so upgrading to an anti-snap cylinder removes that vulnerability entirely.

A Yale lock — properly called a nightlatch or rim lock — is the spring-loaded latch found on many older timber front doors, usually supplemented by a mortice deadlock below it. The cylinder (the part the key goes into) is on the outside face of the door and can be replaced independently of the latch body. When customers ask us about replacing a Yale lock, what they almost always need is a rim cylinder replacement, which is a quick job. Knowing which type of lock you have helps you describe the problem clearly when you call, and helps us arrive with the right parts on the first visit — which matters a great deal when it is late on a weeknight and you are standing on your Bexleyheath doorstep in the rain.