If you lock and unlock your Huawei smartphone using the power switch, there will be a little sound whenever you lock your screen. This tone can be (de-) activated at any time in the settings.

Note: If the Huawei device is set to "Mute" or "Silent", there will be no sound when locking.

Android 10 | EMUI 10.0
Screen lock tone -  Open the  settings
Screen lock tone -  Tap on  Sound & vibration
Screen lock tone -  Activate or deactivate  Screen lock
  1. Open the settings
  2. Tap on Sound & vibration
  3. Tap on More sound settings
  4. Activate or deactivate Screen lock

Huawei Instructions