My iPhone 5 won't turn back on?

I was just watching youtube videos when the screen just froze. I tried going to the home page several times before making the mistake of locking my phone. My lock button doesn't work, so I put it on lock using the iPhone accessibility feature. My phone is my alarm, please help!

Hold down home and on off at same time. If this doesn't work you have to take it to a profesional.

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