If the timer on the LG smartphone has expired, not only will the sound be heard but the device will also vibrate, and if the vibration is (not) desired, it can be turned on or off in the timer settings.

Android 9 (LG UX 9.0)
Step 1:  Open the  Clock -App
Step 2:  Tap on  Timer
Step 3:  Open the  Menu
Step 4:  Open the  Settings
Step 5:  Enable or Disable  Timer with vibration
  1. Open the Clock-App
  2. Tap on Timer
  3. Open the Menu
  4. Open the Settings
  5. Enable or Disable Timer with vibration

LG Instructions
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