iPhone unresponsive and can't switch off

[Sunni]

My little boy touched my phone whilst on FaceTime and it seemed to lovk to a blank black screen couldn't end the FaceTime call and it still shows that screen on background apps 

now I can't open any icons and can't shut or reset the phone

i can scroll but if I touch app to open nothing happens

[MI5]

@Sunni 

You need to reset the phone.

Press volume up then volume down then hold the power button until the Apple logo appears on screen.

[Sunni]

I've tried that and it doesn't work

power button seems to be unresponsive too I can't lock it, when it eventually goes to lock screen itself it unlocks with just a scroll instead of pin code

[MI5]

@Sunni 

Never known one to not reset but I guess you'll just have to wait for the battery to go flat.