if you don't need the lock drill the barrell out, a drill the same diameter as the width of the key should do it.
alternatively if it prodtudes out of the door far enough grind as much as you can off with an angle grinder then simply use the tip of any key to turn whats left enough to slide the lock out (i've done this).
I'm not a locksmith though so someone may come up with a better solution!
Steve
January 2009