Remove Patio Door Lock Barrel

Only one key can be put into a upvc barrel lock at one time you may also find that it is fouling on the door handles and is a tight fit in the door lock try removing the handles and then when turning the key give the lock a good wiggle.
Remove patio door lock barrel. Located in the faceplate on the side of the door the retaining screw is usually even with the bottom of the lock cylinder and keyhole. Remove the door by pulling it out of the top track of the door frame. Slide the door strike up or down until the lock latches easily. I assume your barrel has locked in which case you may need to drill it out.
The door should slide right out of the top track once you ve freed it from the bottom track. Then slip the lock box over the shank and wiggle it back into place over the shank and back plate. Remove the retaining screw. Look for screws hidden underneath.
This trick will allow you to remove the cylinder from the lock even if you dont have the. Some trim may even twist off by hand. This screw is what holds the lock in place. The mechanics of the lock have broken leaving the top section of the door completely.
Remove these screws then pull the two halves of the lock apart to remove them from the door. It will take a lot of drill bits not cheap ones either. Pry the trim from around the handle or lever using a flat screwdriver. When the lock latches easily open the door and tighten the screws in the door strike.
Once the door is completely loose from the frame set it aside somewhere safe such as against the side of the house or lying flat on a work bench. If you have plenty of time then drill away if you have a small grinder cut the face of the the cylinder off as close to the door face first. This is a video on how to remove the euro cylinder lock from a door. Use a screwdriver to twist the retaining screw to the left loosen it and remove it from the faceplate.
Try using the key in the other side of the door. Plan your costs before you buy them and compare it with a quote from your locksmith. If the latch does not line up smoothly with the door strike open the door and slightly loosen the screws in the strike. In this video i attempt to open a patio door that has got stuck locked.
It may be the barrel is broken internally. Re assembling a barrel or yale lock re assembling the lock is now a direct reversal of the procedure you used to dismantle it. Slide the patio door closed and lock it.