Samsung SM-S975LZKATFN - Manual (Page 9)

Y
OUR DEVICE
8
LOCKING AND UNLOCKING YOUR DEVICE
By default, the device screen locks when the backlight turns off.
To unlock your device from the lock screen:
X With your device turned on, press ( Power/Lock)
to wake the display and sliding your finger across the
screen in any direction.
To lock your device screen:
X Press ( Power/Lock). The screen goes black.