Silly question, but why can't you press the reset button? Using the buttons, to hard reset:
Press and hold the volume down and Power buttons at the same time until you feel a vibration (about 10–15 seconds).
When you feel the vibration, release the buttons, and then immediately press and hold the volume down button until you see a large exclamation mark.
Once the exclamation mark appears, press the following four buttons in this order: volume up , volume down , Power , volume down . Your phone should now reset and restart itself. (It might take a while for the reset to finish).
Remember to backup any data you wish to keep first.