My iphone device lock button is not working and i need to get into DFU mode?

I have downloaded the ios 7 beta and occidentally erased everything off my device which mean it is now a 'New iPhone' set up page. I tunes is saying "the device is not registered as part of the iPhone developers program" I need to put my device in DFU mode but I can't because the lock button is not working.

is there any way i can do this?
Really need help

I've got the same problem >.< if I have to pay 100 bucks I mine as well just buy a new *** phone.

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