Locked out!

[Android Question]

My phone (Sony Ericsson) has locked, my friend as a joke tried to get in and she did too many tries, now i havent been on my phone in 3 days because its locked me out, i have turned it off and back on but nothing happened all it does is:
(Slide bar) and then says answer security question or google login. every tiem i tried to log in it failed but i know i left my wi-fi off before i got locked out, any help??

 

[Unforgiven]

Use this tutorial on getting back into your device.
http://androidforums.com/faqs/685025-lost-phone-locked-out-faq.html