When you park your vehicle and the wheels are turned it usually will cause the steering wheel to lock. If you pulled your vehicle straight into a spot and didn't touch the steering wheel it wouldn't lock until you tried to turn it.
Once the steering wheel is locked it can be hard to turn the key. What you need to do is get the pressure off the lock cylinder by trying to turn the key while you jiggle the steering wheel back and forth. You must do this at the same time since the steering wheel will want to stay in the locked position.
There will not be excessive pressure on the key to turn it once you get the steering wheel in the right position. Try to park your vehicle with the wheels straight before you turn off the car, then you won't have to do the whole jiggling the steering wheel while turning the key again.
Once you can turn the key then the steering should unlock. If this is not the case, then there may be a problem in the steering column.
Hope this helps.
〉 Answered on Jul 9th, 2007 by Lori Johnson, Owner and Instructor at Ladies Start Your Engines