2000 BMW Z3 2.6 key will not turn and steering wheel is locked.

What is your question?

My uncles z3 has been sitting parked in the weather for 5 years. I put the key in the ignition and it will not turn and the steering column is locked as well. The key opens all doors and it's the right one. I just got a new battery and thought maybe that would fix the problem. If that doesn't work is there something else I could do. Thank you for any help in advance.