Might be abit to late for this reply lol

but i had 1 rear door stuck when i bought the car, i took the panel off and sprayed with 5-56 (hope that i named so were you live lol) and waited abit, that was enough to get the mecanism working again so i could open the door and take out the lock, clean it up, grease it in and put it back, after that it works like a charm :)