Iphone 7 frozen, but I can still lock and unlock it and use a few other functions. I can't turn it off.

Alright this is super weird. I have an Iphone 7 on IOS 11. I woke up and my alarm went off. I accidently hit snooze so I wanted to turn it off in the app. I can unlock the phone, but I can do nothing on the homescreen. When the alarm went off I just pressed stop and that seemed to work, I can still slide to use my camera. I can still use siri, but when I tell her to open an app it doesn't load. When I hold the power button nothing show up.