My key will not turn in ignition

What is your question?

We can put the key in ignition but it won't turn. It stays in that position. We banged on bottom of key lock cylinder and got it to turn. Now the key won't go in off position and come out. What can we do to get it to release the key? And what would cause it to do that in the first place?

What makes this problem better or worse?

Started when it got cold outside

How long has your 2004 Chrysler 300M had this problem?

Just happened twice before in the last two weeks