These difficulties fall into two general categories.
Rock door lock problems.
Excessive use or not using it often believe it or not may cause these mechanisms to become defective or stuck.
Those related to the lock set or key and those related to the door s frame and latch assembly.
Door lock problems that are a result of debris jamming up the keyway should not be ignored because they can potentially result in more problems like breaking a key in a lock.
The tolerances on doors and hardware is fairly narrow.
Door lock problems are mostly mechanism issues and sometimes they become faulty through wear.
Faulty euro cylinder the door furniture and hardware on a composite door is practically identical to a upvc door so.
This can make the door difficult to close.
Faulty mechanism mechanisms on composite doors are.
Also a broken bolt or latch that causes your door lock to jam might be a symptom of a much larger issue like an attempted home break in.
Step 1 if the key turns but does not operate the lock bolt the lock mechanism is broken.
Like a medical problem this is what we call a symtom.
Tighten the hinge screws and then try adjusting the strike plate by loosening its screws and shifting it slightly.
Remove the mechanism to have it repaired or replace the lock set yourself.
If a door is sagging the lock will not latch correctly.
If the latch does not catch close the door slowly to watch how the latch bolt meets the strike plate.