On the door lock, it's possible that the tumbler is shot. If this is the case, the only option is a new one. Fortunately, it's not as outrageous as you might think, because this car is pre-alarm and it doesn't have the pigtail that has to be connected to disarm/arm the anti-theft system. On the other hand, if the tumbler is stuck at a 45 degree angle, the latch itself could be at fault. You'll need to remove the handle to properly diagnose which is at fault.

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Regards,
Aaron