How to turn on iPhone 4 without lock button?

My lock button has been broken for a couple of months. Yesterday my phone turned itself off and was still on full charge. As it was still charged and it's off it won't run out of battery so I can't wait for it to die then plug it in. I've also tried leaving it charging overnight and plugging it into the computer and neither have worked. Can anyone help me please.

You might have to go to the place you got it. If you got it from a person, you are out of luck.

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