I have an LG phone and my parents locked it, and i need the password. How do i figure it out?

Its an lg rumor from sprint, And i also want to know if it costs to go to the store and question for them to unlock it for me.I Help ?
I just need to know if there is ANY other way to figure out my buzz’s password other than going to the store,
and if thats the only way, Does it cost and charge ? and does it show on your record ?

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