My 96 Mark 8 doors opened from the outside as they were not locked. I closed the car's doors, not locking them as usual. On Labor Day I opened the door but it was mysteriously locked. I tried the passenger side but it is closed too. I tried the car key for the door. The key turns to the left but not fully to the right. Same problem with the passenger door. I do not have a key fob. I am puzzled as to why the doors are locked and the key won't open the doors