iPhone 6s screen froze after lock.

Hello! I use an iPhone 6s 16GB.

After locking it, it the screen just freeze.

I only can hear the music playing, as I was listening to music when it froze.

I can't use it, just to play with the volume.

What can I do to make the screen work again?

I had some simillar problems with it, but the screen worked after, now its just black.

I tried to call Apple Support but they are not at work untill tomorrow.