How to fix an iPhone lock button at the top?

My lock button at the top of my iPhone has all of sudden become sticky and hard to use for some reason. Every time I press it, I have to forcefully perform the action to lock my phone. Are there any ways to fix it?

The same thing happened to my phone today. Although I haven't been able to fix it yet, an easy and helpful way I learned to lock it was
1) to go to settings
2)go to general
3)scroll down to accessibility
4)scroll down to assistive touch and turn it on
-after that a grey tablet should pop on your phone allowing you to lock your screen through that and other things such as screen shotting.
Hoped I helped, of you find out any other ways to unjam the button please let me know.

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