There should be a stop on the top or bottom of the door that the doors hits to prevent the door from sliding to far.
Sliding door lock stuck closed.
Difficult to advise you on how to handle the lock without seeing it.
Open close lock unlock then 2 days later it did it again.
The pictures look like to me that the door slid past the stops.
In order for smooth and easy operation there is some slack that can potentially cause your door to come off the track.
The mechanics of the lock have broken leaving the top section of the door completely.
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.
Sometimes patio doors become hard to open even when the track is clean.
Sometimes the set screw holds a cover plate on take the cover plate off and then you can get at the screws underneath the cover plate.
Went back and forth with the assembly lock and unlock worked smoothly.
Power door works fine now.
Your sliding door operates on a track to open and close.
Passenger sliding door is stuck in lock position and won t open 2 years ago i replaced the lock actuator i pulled the inside trim off and with some force was able to unlock the door.
If you can t budge it at all it most likely is the lock.
If possible post a photo of the lock.