Twist on black screen of death - how to turn off in the first place so you can do the reboot

My wife's S6 is on. You can call it - it rings. It is receiving text messages. The screen is totally black and non-responsive. All of the postings regarding a system reboot all say to turn it off and then hold a combination of buttons. I can't power it down with the screen non-responsive. Any suggestions for how to power it down?

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