The power button fell off my Moto phone, but I found there was a two finger swipe gesture that would work until I could order a new button. However, you can't really do this one handed while on the move, so i ended up having to do a combination swipe with my thumb and the tip of my nose to turn the screen off.
I think the people in my neighbourhood think i'm weird now, because they would often see me walking past while rubbing my phone across my face.