Ah, the old which comes first dilemma again. You need the key to get the old one out, but if you have the key you don't need to get it out. Best bet is take it to a locksmith.
1953 Chevrolet 3600 Fried Green T'mater (Vern) In the Stovebolt Gallery Caution: Political Statement Man who runs in front of car gets tired, man who runs behind car gets exhausted.
