My iPhone 7 won't turn on?

So last night my phone was fun. Then I woke up and my phone wouldn't turn on. At first, the screen was just black, but I could press the button. Then I tried to restart it but the apple logo would just pop up for a few secs before fading to black and now I can't click the button. WHAT DO I DO? And how much would it cost to fix this problem at a tech store?

Try holding the power and home screen button for 10 seconds