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)
Step 1:  Open the  Settings
Step 2:  Tap on  General
Step 3:  Tap on  Lock screen & security
Step 4:  Tap on  Secure lock settings
Step 5:  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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