I left this morning on a local drive. I locked the car up upon exiting the vehicle. I came out and hour later, and the key would'nt open the driver's side door. I tried 2 or three times reinserting the key, and trying to turn the key to no avail. I then decided to try and open the passenger side door for access. The key turned the lock and the door opened. I then reached across to pull up the plunger on the driver's side door. I drove the car home, and then tried to lock the driver's side door, and the key would not turn either way in the lock. I then went over to the passenger side door and tried to lock the door. Again, it was like the driver's door the key refused to turn in either direction. Since, the purchase of the car the key would lock the driver's side door and unlock it, but the key would not lock the passenger side door. It would only turn to the left if the car was locked freely like to lock the car door, but not unlock it. I am lost at this point on what might be going on? Would appreciate any thoughts or help on this. Thanks!

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Rebe