App instead of power button

Hi all, my power button has went in but it's still pressible but very hard.

I am using stock rom without any root.

My warranty has already completed, I need a nice app which does the job of power button.

Double tap to wake is not working properly in my mobile because i have installed a temper glass for my screen.

I am currently using Gravity Screen app which is great to use. But i have one doubt, using proximity sensor for prolonged period will it damage them or there is no problem.

Or else are there any other app that will do the job of power button without using the proximity sensor.

Thanks in advance for your help