If we lock the OnePlus smartphone via the on/off button on the edge of the device, we get an acoustic feedback in the form of a tone by default, which is similar to a lock.

The screen locking sounds can be enabled or disabled at any time if the user wishes to do so.

Android 10 (OxygenOS 10.0)
Step 1:  Open the  Settings
Step 2:  Tap on  Sounds & vibration
Step 3:  Tap on  System sounds
Step 4:  Enable or disable  Screen locking sounds
  1. Open the Settings
  2. Tap on Sounds & vibration
  3. Tap on System sounds
  4. Enable or disable Screen locking sounds

OnePlus Instructions
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