Not to long ago I came out of city hall parked in 30 minute spot.  The key wouldn't work, no matter how I put the key in it wouldn't turn.  I forced, jiggled, cussed, called the cops to tell them I might be there awhile, they said I'd get a ticket anyway.   So after 20 minutes I pushed it 2 blocks away and parked.  I put the key in my pocket and felt another key, the motorcycle key.  I had been using my work truck key which has the same keychain bob as the motorcycle   
Ahhh!!!!!