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You can crack a 3-digit combination lock by sequentially trying every possible number. Writing down and keeping track of every number used will help avoid confusion and speed up results.
Start dialing. If it's a three digit lock, then you can try all the possibilities in a reasonably short time. If it's a four digit lock, then it will obviously take longer, but it's still something a diligent person can manage in an afternoon. (If you try a combination per second, which isn't that hard, you can exhaustively search out a four-digit combination in at most 3 hours.)
12-3-6-9
You should try out all of the three-digit combination. There are 10x10x10 = 1,000 possible combination (assuming digits 0-10).
3 digit numbers are lessthan 4 digit numbers