Iphone 7 won't respond to touch or turn off?

Starting yesterday it has been unresponsive. I can unlock it, but after that I can't go into any apps. If I ask siri to open an app it doesn't do it. I tried holding down the power button or the power/home button but nothing happens.

With an iphone 7 (or later), the home button is a touch sensor rather than an actual switch…

To reset it, hold the power + volume-down buttons for ten seconds or so.
It does not delete anything, just forces a proper restart.

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