It did not latch shut.
How to fix the patio door lock.
Have one person go to the other side of the door and hold the handle.
How to fix a door lock that is jammed due to freezing comes down to the type of freezing.
They are often used in higher end doors because steel mortise locks are more secure than the cast aluminum alloy versions used in many patio doors.
Turn the patio door knob up and down to inspect it for foreign objects dirt or rust.
The lock is built into the handle.
Step 4 finding a replacement.
These are the easiest to replace because most of the time you just have to pull out 2 screws remove the old handleset and bolt on a new one.
This sliding glass door lock was not working.
If it won t lock open the door.
The newer versions have the same handle on both sides.
Donations appreciated click in upper right corner info circle.
The best way to lubricate any lock is to disassemble it and use an aerosol lubricant to flush away grime and coat the moving parts of the lock.
Take an allen wrench and loosen the set screw under one of the handles.
If you live in a windy area place a heavy object against the door or use tape to keep it from opening up after you ve removed the lock.
Clean the door knob and lock with a degreaser and a wire brush.
Locks can essentially be frozen in two different ways.
The picture above shows an 070001 model lock.
Try to lock the patio door.
In addition to cleaning and lubricating sliding door tracks you want to lubricate the door lock.
Another variation occurs when the internal mechanism of the locks is frozen.
It s an easy fix.
Two screws on the end of the door secure the latch.
Spray lubricant onto the entire knob and lock assembly for better operation.
Make adjustments to the latch adjuster screw as necessary until the latch catches properly and locks the patio door.
If it is loose or has slipped out of the mortise place it back in the mortise and tighten the screws with a phillips screwdriver.
Sliding glass door locks such as the steel mortise style locks shown on this page are used in wood vinyl and aluminum patio doors.
Remove these two screws and gently pull out the latch mechanism and its cartridge.
Shut the door and try to lock it.