My phone got locked and I have no solution

Hello buddies,
I am using Samsung Galaxy Ace mobile. It was working fine so far.
Today, some how it got locked. When I am trying to unlock, it is asking the Google account and even after entering my Google account information it is not getting unlocked. I have tried all ways shown in the forums but nothing worked.
How can I make this work again? Please someone help me out here. Thanks a lot in advance, guys!
