The principle is that you hold enough torque on the lock to allow pushing the individual
tumblers/disks to their proper position but not to allow them to spring back.
When you get all of them right, the lock cylinder will turn.
So you need one tool to apply a twisting force and another to push the tumblers.
From there on, it's all practice.
A small screwdriver might suffice for the first one.
I've made picks out of LARGE paperclip wire, straightened-out box staples or whatever
I could find.
Think McGyver.....
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George Downs, Bartlesville, Heart of the USA!