Huawei Honor 3C H30-U10 Quick Start - Manual (Page 7)

Locking and unlocking the screen
Your phone automatically locks its screen after being idle for
a specified period of time.
Alternatively, you can press the power button to manually
lock the screen. You can go to and touch Display >
Sleep to set the screen timeout period.
If the screen is off, press the power button to turn it on. Slide
your finger in any direction to unlock the screen.