2013 Hyundai Sonata door won’t unlock

I cant get the left rear door to unlock. Its locked and it will not open?

The door lock actuator rod probably came off or the power door lock actuator motor is seized…Remove the door panel from inside the cabin and lubricate actuator mechanism. Also, make sure you didn’t activate the child safety tab by mistake.

Thank you for your help. It sounds like very good advise,