Try opening the rear door driver side and operate the inside handle.
Transit van side door wont lock.
If your drivers side door won t open try spraying some wd 40 into the area where the door connects with the lock inside the car.
Then lock it all up as normal.
Ford transit lwb 55plate lock with remote then it unlocks its self.
Video about how you can open stuck sliding door on ford transit mk6 van.
I had to take out the lock to repair and decided to show whats happening when rotary knob gets stuck.
This will lubricate the lock.
This happened on a 10 plate transit last year more than once.
What happens is when it receives the lock signal because one of the locks wont fully lock as above it then kicks the locks open again as the system thinks there is a door not fully closed etc.
If not if its the same then there is usually a sticking sometimes faulty lock mechanism on the van.