Samsonite suitcase that has a 3-digit combination lock plus 2 key locks. I forgot the combination so how do I set up a new combination?

maximum of 1000 combinations (10X10X10). Work with one lock and set it to read 000 . Count upward to 1000 by "ones". As you turn combination dial up with one hand, test if lock opens with other hand. Takes about 5 minutes and hopefully both locks are same combination.