On / off button is not working?

I have a huawei mate 20 lite (for almost 1 year) and it works perfectly, only my my on / off button does not work anymore. So the button on the side.

I've also tried that I put the auto on and off to 15 seconds and then my phone is synonymous and if I want to do it, it is not synonymous, then I use the fingerprint and that works. What could I do that he works again?

The button is probably through.

Via adb