Power button will not work on LG Lucid

The power button on my LG Lucid will not work, so every time my screen times out, I am not able to push the button to use my phone again. If I try to push the power button (not even holding it down), after a few seconds it will just restart itself, but that still does not fix anything. I can't even manually restart my phone anyway because the power button (the part of the phone that has to be pushed to restart a phone) is the part not working. I have to plug my phone into the charger and then unplug it for my lock screen to come up so that I can use my phone again. I have no idea what is going on.