I have a 1999 Saab 9-5. For the past 4 years I have only used the key to lock/unlock the doors. (i never liked using the fob.)
Lately, once a week I am unable to turn the key in the lock. It does not budge. Sprayed some lubricant, but no effect. It stays stuck -either locked or unlocked a few days, and then goes back to normal.
When it sticks locked, I’ve unlocked the hatch and crawled inside. I can unlock the doors then from the center console, but once I exit the car, I can’t get the key to turn to lock it again.