Have you tried to hold the steering wheel hard one way and then turning the key? did you do the same thing going the other way? YOu have to hold it while you turn the key not just wiggle it.
If that does not work let me know and we can go deeper to solve your problme.
i have tried all of the above,nothing works
Have you tried to turn the key over? The key can go in either way and some times the lifts and valleys get worn and the key will not move the tumblers.
I will work with you till the problem is solved.