Try this link: [GUIDE][MAC][PC][LINUX] How to Unlock, Root and Flash Recovery - Android Forums at AndroidCentral.com
I used it to get in to my N7 with a broken screen to unlock then re-lock to return it to factory settings. I had facial recognition with eye blink and password. Because the screen was broken it had no touch response. Still had great display though.
I needed to wipe my info so I could sell it. Without touch response I couldn't enter any menus. The info in the link WILL wipe EVERYTHING and return to factory fresh so you'll have to reload everything again but you'll have access to it again.
The hard reset routine using the power and volume buttons didn't work for me either. In fact I haven't read of anyone that has actually tried it having success. I've seen posts from people that have asked ASUS about this and they supposedly know it doesn't work and don't plan to address it. Don't know if I believe that but all I know is it didn't work for me.