ignition lock is stuck on off?|The Key is not stuck in the ignition?| on 2003 Chevrolet Impala

My ignition lock is stuck on off position the key slides in and out freely but won't turn to any other positions? Example ign, on, start the steering wheel is not locked either? There was no real warning for this malfunction. Any ideas on an easy fix would be great its my work car and I am trying not to stick much money into it..
Thanks

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2 answers
The key may be worn out. Have a dealer cut you a brand new key and then try that key. If that doesn't work, then you will have to replace the cylinder lock.
call a mobile locksmith you likely need a ign switch assm approx 120.00