Today I put my 02 Protege LX ( with 93k miles) into Park, switched it off the ignition and the key stopped turning at the ACC position and would not turn to the LOCK position so I could take the key out. It turns back and starts up and turns off, but will not go past ACC. I drove the car home and garaged it. There was no indication that failure to turn was imminent.This is the first time the car has failed me since I bought it over 10 years ago. What could possibly be the problem?