Ummm... yeah, didn't have topics like this just this past week or so? Pretty much, in order to get them to open up the machine, you just have to assure them that nothing bad will happen to the machine, and get the appropriate codes corresponding to the mix you are working with. Also, sucking up and/or complaining (include many other people, too for better results) works in getting them to open the machine to do the unlocks if they're stingy about it.
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Kel
~ Takin' the dance pad to an all-new level! ~ DDR is not just a game... it's a part of your life. ~ We all dance. Different music, different steps. But we all dance. ~