My Screen is black

Hey guys, I am experiencing this very serious issue.

1. My Screen is completely black.

2. My Power Button doesnt work anymore (its always been now)

3. can't access the Assist Touch Thing either.

4. Can't turn off phone any other way.

5. I am able to access Siri but I still cant see the screen, but I can speak to it and it response, but that's as far as it goes.

6. I literally fully charged the phone today and its going to take eternity for it to run out of battery (right when you need it to right?)

Is there any other way for me to turn the iphone off without using the iphone itself??