Not sure I understand what you are saying? If the key want turn in the ignition, turn the wheel hard until the key turns. I have seen times that my wheel want lock, after having in off the ground. Not sure why it does this?
You probably aren't going to get any BMW specific help, so I'll give it a try. It is my belief that your ignition key works a "pin tumbler lock". If so, an internal part is binding, or a foreign object is in the key-way. You may be in need of an old fashioned locksmith. Alternatively, you could take it apart yourself.
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