What is wrong with the ignition of my car if the key won't go in the ignition? on 2004 Cadillac DeVille DTS

A foreign key was put into the ignition by mistake, now the right key won't key won't go in.

Asked by for the 2004 Cadillac DeVille DTS
2 answers
maybe tumbler
sounds like the lock pins inside are gamaged call a mobile locksmith in your area to repair