Picking the lock is the most sensible, easiest way to open that lock. The internet sells so many lock-pick sets, Don't go for the cheapest sets. They break off in the locks all the time. A simple, small set (USA made) is all one needs. I've opened countless locks on old coin operated machines, last week I opened a 1934 Mills 5 cent slot machine in front of the owner and he was delighted to see the cash box was FILLED with old "V" nickels and Buffalo nickels.