How to fix my iphone 4 home and off button?

I was on my settings screen on my Iphone 4, and when i pressed the home button, it didn't take me to my home screen, it just stayed on my settings screen. I then tried my off button, which was also not working. I then looked online (on my computer) about this problem, and found many possible solutions such as AssistiveTouch, and when i tried that, the home button didn't take me home. The buttons appear to be working though, as I can take a screenshot, so I'm very confused.

Maybe it froze. Try pressing harder. Or reboot it

Press the off and the home button at the same time for 5 or 6 seconds.

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