There seems to be some confusion as to my problem.

With the radio in the dash, I inserted a key in the righthand slot. The key activated the latch and is stuck in the hole as it should be. I inserted the other key into the left slot, but the key will only insert about halfway and will not "catch." Therefore, I have one key stuck in the right slot--I cannot release it because the radio has to be out to do this. And a left slot that will not accept a key. One side works--the other side does not.