I went to start the car and something popped in the switch and there is little resistance when turning the key. The ignition switch is in the on position, lights on, and will not turn off. I had to disconnect the battery and leave the car in a parking lot. What usually breaks in the ignition switch? I was thinking of pulling the lock cylinder out and trying to turn the ignition with a screw driver so I can get it home to work on it. Any advice?