Unlock iPhone with Voice Command
Open the Enter Passcode Screen on iPhone
Mark the Passocde Location on the screen
Go to settings
Open Accessibility > Voice Control
Enable Voice Control
Tap on Customize Commands > Create New Command
Under Phrase type in any word with which you would like to unlock your phone
Tap on Action > Run Custom Gesture
Tap exactly where you just marked the passcode and tap on save
When your phone is locked by saying the phrase you can unlock the phone