yes it happened to me and I was in Shock
, but I could solve the problem 
How?... very simple.
When your Iphone get's stuck and you'r not able to shutting it down, you have to press at the same time two buttons (these buttons are the sleep or power button and the menu button) by 10 or 15 secs and the iphone will restart or shutdown.
If the Iphone shuts down just power it on and check if everything is ok.
I don't wish this issue to anyone, becuase I`ve heard that sometimes the Iphone dies
Well I hope this tip helps you! Greetings!
