iPhone 7 won't force reset
You can try putting it into DFU mode. A google search should turn it up.

Steps to DFU Mode:


Plug your iPhone into your computer and open iTunes. It doesn’t matter if your iPhone is on or off.
Press and hold the Sleep / Wake Button and Home Button (iPhone 6s and below) or the volume down button (iPhone 7 and above) together for 8 seconds.
After 8 seconds, release the Sleep / Wake Button but continue to hold the Home Button (iPhone 6s and below) or the volume down button (iPhone 7 and above) until iTunes says “iTunes has detected an iPhone in recovery mode.”iTunes has detected an iPhone in recovery mode
Let go of the Home Button or volume down button. Your iPhone’s display will be completely black if you’ve successfully entered DFU mode. If it’s not, try again from the beginning.
Restore your iPhone using iTunes.


Source