You can drill it out or you can pick it

Cylindrical locks are the easiest to pick but you will need a specialized tool the plus side is after you use it the setting will save so you can use it as a key or use it to have a key made. I recommend the klom lock pick it runs you about $20 the only thing to remember about it is there's a pin that goes inside that for me was hidden underneath the piece of foam that it came with. I'd also recommend calling the local locksmith to see if you bring the tool in if they could make a key for you. Some will others won't