Lexus LS460 - The Rear Door Cannot be Opened; The Trunk Lid Is Closed with the Electronic Key Left Inside

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What to do if... (Troubleshooting)
LS460_EE (OM50D49E)

Is the child-protector lock set?
The rear door cannot be opened from inside the vehicle
when the lock is set. Open the rear door from outside and
then unlock the child-protector lock. (P. 148)
 The function to prevent the electronic key from being left
inside the trunk will operate and you can open the trunk as
usual. Take the key out from the trunk. (P. 124)
The rear door cannot be opened
The trunk lid is closed with the electronic key left inside