How do you unlock 2008 Lexus ES350 with dead battery?

To unlock a 2008 Lexus ES350 with a dead battery, use the physical key hidden within the key fob. Slide the latch on the back of the fob to release the key and then insert it into the driver's side door lock to manually unlock the door. If the car is equipped with a smart key system, you might also be able to start the vehicle by placing the key fob near the start button while pressing the brake pedal.