A frozen phone is a common (and frustrating) phenomenon, but there are ways to bring your device back to life. If your iPhone isn't responding, and you're not able to power it off and then on again, ...
So, the kid slipped and cracked the screen of their iPhone SE (3rd Gen). There is a reputable repair shop near me (I've used them to fix devices for other family members, but well before FaceID), but ...