My iPhone is frozen. Cannot turn off. No apps respond to touch

See this link and follow the instructions provided

If your iPhone won't turn on or is frozen - Apple Support

We don't know. We do know that the folks at the Apple Store will first try the same thing that we have suggested, so it would make sense for you to try that before you try to fight the crowds at the Apple Store and are told the next available appointment is on Tuesday.

If your iPhone won't turn on or is frozen - Apple Support