My iphone 4 won't let me play music or videos?

So recently my lock button stopped working and my phone keeps lockin and unlocking itself and goin to the slide of turn off screen so i put on the touch i on to lock screen thingy. But as of yesterday my phone won't play vidoes or play music. It loads an buffers but when i hit play it doesn't actually come on. I thought of turning it off maybe but how will i get it back on if the button doesn't work? Could someone either tell me how to put phone nack on without lock button or how to fix the music and videos problem please?

Try rebooting the device.

Hold in the home and sleep button until the screen turns off and it will shut off and then turn back on.

Hope thathelps!

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