The Car's Wheel Lock is Engaged

• A wheel lock is engaged when the car is in park, turned off and the steering wheel is turned a slight amount. It prevents car thieves from steering the car if they get it started.
  
  

The Car's Key Is Bent or Chipped

• A key that is either bent or has chipped teeth will be difficult to use in the ignition because it does not correctly fit the ignition switch anymore. Consider replacing the key at either a local hardware store or your local authorized dealer depending on whether your key has any electronics embedded in it or not.
  
  

The Steering Column Has Malfunctioned

• Your car's ignition is a part of the overall steering column. If the rods connecting the steering wheel to the ignition are loose, missing screws or bent, you will have difficulty turning the key when it is inside the ignition.