By default, pressing the power button immediately locks the LG unit, ignoring the lock timer. When the unit is brought out of sleep mode, the LG unit must first be unlocked.

To activate the lock timer, the "Power key instantly locks" function must be deactivated.

Android 9 | LG UX 9.0
Power key instantly locks -  Open the  Settings
Power key instantly locks -  Tap on  General
Power key instantly locks -  Tap on  Lock screen & security
Power key instantly locks -  Tap on  Secure lock settings
Power key instantly locks -  Enable or Disable  Power key instantly locks
  1. Open the Settings
  2. Tap on General
  3. Tap on Lock screen & security
  4. Tap on Secure lock settings
  5. Enable or Disable Power key instantly locks

LG Instructions
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