2001 Dodge Caravan ignition key will not turn

When i went 2 start the van the steering wheel was not locked and the key would not turn. I had 2 turn the wheel 180 degrees b4 it would lock. The key still will not turn. I turned the steering wheel a little 2 take off pressure and the key still will not turn. I have not had any previous problems with the key or ignition system.