My name is ***** ***** certified professional with over 10 years experience. I will be glad to assist you with this.
I am sorry to hear that you are having this issue.
This could be a glitch in the software and the iPhone needs to reboot, lets try and force a reboot > Hold the home button and the power button down for about 30 seconds or until the Apple logo appears on the screen, then release both buttons.
The iPhone will then power on normally.
Please let me know if you need any other assistance.
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Press the Power button and the home button at the same time. The home button is at the bottom of your screen on the front of the iPhone.