What's wrong with my lock button?

I have an iPhone and I've ha it for a really long time, but two maybe three days ago my lock button stopped working. Like I don't know I think it's not pushing in enough but I can't make it go in. I took it to the apple store and the guy was like "oh I see the problem." -he didn't tell me what the problem was though- and he also said I could trade it in there or wait for my upgrade -nobody had time for that- an that there was also a thing you could go into your settings and make a lock screen on your home screen to press but I can't find it. This is driving me crazy to have to sit and wait and wait for it to lock plus I can't take screen caps. So is there's a way to fix my lock button or does anyone know how to find the little touch screen lock?

Same thing with mine! It's brand new and when I click the home button it doesn't work unless I hold onto it.

If you go on settings, look on general, scroll all the way to the bottom and there's a accessibility button, press that, then scroll all the way down again and find assistive touch, press on it and click the off button to turn on. Hope that helped!

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