^^ corroded door lock mechanism. Lack of use with key makes the lock jam up.Insert your key and spray wd40 down the barrel and work key from left to right several times.
Spray some wd40 into the door lock and remove the inspection rubber grommet (side of door) aswell .
Its purely a corrosion issue.
Clear error code in vcds and you should be fine.
If it comes back , new barrel is req.