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Actually the number 2 answer is to call a locksmith. The first choice is to see if anyone living with you can come and let you in. But after that you call a locksmith.
Of course you will need to prove this is your home. We are also assuming here that you got locked out by accident, not deliberately.
I merged your threads, please don't start multiple threads with the same issue.
As to finding a locksmith, use the Yellow pages, call around for price quotes. ask neighbors for recommendations. Basically the same thing you would do to find any service provider.