If you unlock the lock screen of your Samsung Galaxy S6, then you will hear a sound. This so-called screen lock sound is heard every time you lock or unlock the Samsung Galaxy S6. Would you like to disable this sound, then these instructions here will show you how it works. For this please navigate in Android as follows:
Open on your Samsung Galaxy S6 from the home screen the following settings Path:
Menu --> Settings --> Sounds & Notifications --> Ringtones & Sounds --> section “system”
Here you can disable the screen lock sounds by moving the slider. If the controller is grayed out, you have successfully turned off the lock screen sounds on your Samsung Galaxy S6.