Press in a strong way

Pressing this button in a strong way can also help, just press a few times very this button.

Because it's possible that there is some sand or dust in between with the consequence that your button won't work, because he isn't connected with your phone.

The second thing that you can do with your fingers is moving around the button. Follow the form of this home button while you press a little bit. Maybe now the button is clean with the consequence that the problem is solved.