can't turn the key in the ignition

[zacut]

Looking for any advise. We own a 04 Avalanche. Last night we needed to move it back a few feet so my wife hopped in, turned the key, put it in neutral and let it roll back about 10 feet. She put it back in park, removed the key, got out and locked the door.

Today I hopped in and I can't turn the key. I tried the other key (both original and no luck). I can't find a blown fuse anywhere (thought maybe there was an electrical interlock) and I disconnected the battery for an hour hoping that might change things but no luck.

Anyone have any other ideas? Does the ignition have an electronic interlock that will stop the key from turning? Only 45,000 miles on the truck.

Thanks