It could be 1 of 2 things.
Multipoint door lock jammed.
I am showing how to disassemble and free a jammed sash upvc lock.
Definitely not the fault here was the multipoint mechanism this is the long locking strip in the edge of the door and in this case the gearbox the center case in the middle of the locking strip i carry most multi point gearboxes so it was simply a case of replacing the part in the door.
Then insert a small screw driver awl etc.
Route drill cut or remove the wood to expose the slot.
To rule out any problems with the cylinder try inserting your key and turn to unlock.
Usually a simple spray of lubricating oil on the working parts is enough to sort out the problem.
A door lock can also start jamming due to a lack of lubrication.
Pictured below is an example.
This problem with the multi point locking system can develop over time until the lock suddenly stops working.
Sometimes the pins and levers inside a lock become so dry that they stop moving smoothly and eventually seize up.
If you do not have a proper broken key extractor you can use a jigsaw blade or a pair of tweezers.
A multipoint lock that is engaged when the handle is lifted if your door is misaligned or if there has been excessive pressure placed on the door then it can cause damage to the locks.
The bottom hook has slipped out of it s adjustable teeth if it has them which hold it in place for different size doors.
The wood can be removed from this area to expose the slot.
On doors where there is a multi point locking system this can be a sign that the system has been worked too hard.
The bottom of the vertical slot is about 1 inch above the thumbturn cylinder slot and abou 1 4 inch off center towards the latch side of the door.
If the teeth connected to the bottom hook are not in the right position then lifting the handle will not bring the hook completely out for you to open the door.
In this video i attempt to open a patio door that has got stuck locked.
The mechanics of the lock have broken leaving the top section of the door completely.
