Mortice lock getting trickier to open from outside

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30 Jun 2025
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I have an issue with the mortice lock on the door of my flat that's in a communal building (3 other flats) - it locks and unlocks fine from the inside, and locks fine too from the outside. However, over the last few days, unlocking it from the outside is getting trickier - if it seems to be stuck, giving it a quicker turn with a bit more force behind the turn budges it. I've not been locking it just in case when I go out, which of course isn't ideal - is there anything straightforward I can try (WD40 etc.)? I am one of the least DIY minded people ever so anything involving drilling or taking the lock out is beyond me!
 
There are lots of locks. Please show us some photos of yours.

Perhaps it is dirty or worn out.



Also, try using the key when the door is open. Is it any easier?
 
Include photos of the bolt of the lock when it is out, from both sides, above, and most importantly from below.

And of the staple (keep) in the doorframe.

And a photo of the key. It may have worn bits. Try your spare key and see if it is the same.
 

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