Cant turn the key???

My dad and I went to pick up my Grandmothers early 90's Cutlass Ciera SL and the key will not turn in the ignition. The car has been sitting for about 2 years and the battery was dead, but we hooked it up to our car and the windows, lights, etc. were working. We jiggled the steering wheel and lubed the pins in the key cylinder and worked them up and down, still no luck. It does not appear to be a key related issue and hopefully one of yall will know what to do. Thanks a lot.

Eddie