If the handle is broken, then you'll have to manually open it. If the locking mechanism is frozen, you will have to manually open it. Generally that means pulling the back panel off and pulling the latch cables by hand. Sequoia forums have detailed information on how to remove the rear panel - fairly simple.
Removed the back panel from inside staring from top to bottom of the plastic, and you will be able to open. Then replace the back door handle.
where is the botton to open back door on 2003 toyota sequoia
Smash in the window with a hammer.
the rod for the door handle is held on with a plastic clip it may have wore out
Unattach the door
it is possible that the rear door on a 2002 Sequoia won't open properly because the latch got rusted shut. Try some Liquid Wrench or WD-40 in the lock mechanism and around the seal and entire door.
Our mechanic had to climb through the inside of the car, into the trunk area and open it by removing the hatch cover. That's the only way he could replace the latch.
you cant
I assume that the latch is broken? You can get a stiff wire and poke it in the hole on the right inside section of the handle - hook the release lever and pull down while pulling outward. If this doesn't work or the hole is blocked by part of the handle, then you'll have to pull the paneling off from the inside. Look on the Toyota Sequoia boards - there are tons of explanations on how to do this and some even provide pictures. You probably will need to replace the rear handle - not that hard a job. The dealer wanted $400; I did it for $15 with an eBay knockoff.
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shift e+3
check the child safety lock