I have googled the crap out of this but can't find a solution...

I busted my work iPhone 5c. The screen comes on but will not slide to unlock. I want to back it up and do a restore to wipe it clean before I ship it back to IT.

When I hook it up to my MacBook Pro, it prompts me to unlock it. I tried getting Siri to unlock but she wont do it:(

Any ideas on how I can force it to unlock w/o being able to slide?