Screen on/off button on my iPhone 4s doesn't work?

Its very hard to push all the sudden like its stuck. I had it in a otterbox defender series since the day I bought it and nothing has been spilled on it or anything not sticky or anything whatsoever. I have it through at&t and have a warranty just wondering if I should should go there or right to an apple store. Any help would be appreciate thank you.

  • Power button and home button doesn't work on iPhone 5C? Hi, so a while ago I dropped my phone in water, I took it to a repair shop and they fixed it but when I got it back the power and home button didn't work, I turned on assistive touch so I can use my home button and turn off my phone, now I can't turn it on without using my charger or having someone text me, is there any other way I can turn it on without having to do that?
  • My iPhone screen is all black and my power / sleep button doesn't work. What do I do? I clicked on this app & my phone turned all black all I could see was the status bar and that's it & I pressed the home button but it stayed frozen, it didn't work. & well my power button doesn't work so yeah and then my iPhone locked and now I press the home button and Siri works and everything but my phones screen is still black!
  • My iphone 8 screen froze so I tried to turn it off and now it's been stuck on a black loading screen not turning off, what do I do? I just got this iphone 8 yesterday and as I was texting someone the screen froze and nothing I did was helping so I forced it to restart and it started to shut down and restart but now it's just been stuck on the black loading screen not changing. What do I do?
  • My home button and lock button don't work on my iphone 4 Okay so about 2 weeks ago my lock button stopped working and I don't know why so I went to mts store and they said to go to the apple store and i haven't been able to go yet and then tonight I was on my phone then I went to eat dinner so i put it in my sweater pocket then after dinner i took my phone out and it wan't responding! Is there anything I can do right now other than going to an apple genius? It's like 9 at night!