unlock the children protection lock

You may find the info here: http://qrg.toyotapartsandservice.com/pdfs/2009_LandCruiser.pdf

These used to be switches on the edge of the door panel that you could access only when the door was open. With this new Land Cruiser, I can't guarantee that's the way. I'd call you dealership for help, if you can't find it in the owner's manual. These things are becoming technological tour de forces.