My 2009 Aveo will not shut off using the key. Key rotates fine. It will start the motor just fine but nothing can be shut off with the key. Right now, the only way we can "kill" the engine is to set the brakes and stall the engine by trying to engage the clutch. Just for safety, we are disconnecting the battery after parking in case there is an electrical component still energized. Is there some sort of linkage between the rotating part of the switch down to a mechanical switch that may be disconnected or could it be the physical electrical switch is broken?