My Samsung S6 screen frozen and no buttons are working

[Android Central Question]

I was playing a game on my Samsung Galaxy s6.
The screen became frozen and none of my buttons are not working(home,lock and volume buttons). Now i dont know what to do to sort this out without sending it into a store

 

[Rukbat]

Hold the power button in - it could take as long as 30 seconds for the phone to restart.