Before you drill, and I regret it, but it may come to that, try these paces.
Don't know if you can read the code on the lock, or if there is one, but it may help
John Durfee
http://www.jukeboxparts.comVern Tisdale
http://www.verntisdale.comVictory Glass
Victoryglass.com
Lloyd @ Coinopwarehouse
Coinopwarehouse.com
Most of the time, the lock is missing, or opened. Again prewar parts are a tough find except for a few models.
Drill the lock out, a replacement lock w/ cam is under $10 if nothing turns up