My lock button on my iphone is harder to push now?

So I noticed that my lock button is harder to push then it did before, does this mean I should stop pushing it and just get a lock app? Because I don't want it to get stuck…

I think if you look in your settings there's a thing where you can lock your iPhone its a little bubble thing that stays on your screen and you can move it around and you can lock your phone and to open it again push your home button

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