I found a iphone 5 someone

I found a iphone 5in ikea about a halfhour ago i picked it up but it has a password i'm trying to give it back to its previous owner because i know how i would be if i lost my iphone 5! Can someone tell me how to get into the phone also the lock button if that helps

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You could take it to an Apple, AT&T store & explain what the situation is & they should handle it from there.