This is an informative video from 9to5Mac’s Jeff Benjamin. If you already know your way around shutting down and restarting your iPhone, jump to 2:20 in for a little used shutdown method that doesn’t require finger gymnastics, then rolling right into a force restart method you might not be aware of:

Press up volume, then down volume, then press and hold the power button, all in quick succession.

Go ahead and give it a try. You can cancel and, as you’d expect, you’ll need to type in your passcode, just as you would if you did the press and hold the up volume and power button at the same time.