I broke my screen- how can I power down?

[ButtonBoy]

Like it says, I broke the screen (crushed in the frameworks of my recliner) but it is still powered up. I press the power button, and I can feel it twitch, but it never shuts off. Is there any multi-button way to power down? Not only can I not see my screen, but I think the touch is bad as well. I could not get it to answer the call when I called if from a land line.

I've pulled the SIM, so that all my calls go to vmail.

 

[ButtonBoy]

Good news- I got it to shut off. The only way to tell is to connect it to my PC and see if it enumerates in the device manager. It does not show up under adb or fastboot, so I must have deleted all those keys with the last OOS update.
If I just hold down the power button for about 30 seconds, it eventually gives one big twitch indicating that it is shutting down. After that, it does not enum in device manager any more, although the charging LED is still operational.
More good news- I have a new 7 Pro on the way as a replacement. Looking forward to that.