Ringer/volume isn't working on my iPhone 4S. What should I do?

Today, I found out that no sound is coming out from my iPhone, not even the sound it makes when you touch the screen or lock it. I tried to turn up the volume by pressing the side buttons, but the blocks are gone. I've tried to restart it and go to the settings too and nothing has happened. Sometimes it makes sounds, but it is only when I lock it or type in my passcode. And that is rarely. I'm getting really frustrated. There's even no sound when i play a video. Please help. Thank you!

Added (1). I've tried to press the sleep and power button at the same time, and nothing happened.

Added (2). I've tried to press the sleep and power button at the same time, and nothing happened.

Mine is doing the EXACT same thing

My audio stops working when I try and listen to music in YouTube or other audio recordings, what should I do?

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