If a lock screen is set up, a sound is emitted when the screen is locked or unlocked; this sound can be turned on/off in the System Sound settings, but cannot be changed.

Android 10 (One UI 2.0)
Step 1:  Open the  Settings
Step 2:  Tap on  Sounds and vibration
Step 3:  Tap on  System sound
Step 4:  Enable or disable  Screen lock/unlock
  1. Open the Settings
  2. Tap on Sounds and vibration
  3. Tap on System sound
  4. Enable or disable Screen lock/unlock

Samsung Instructions
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