Door lock stuck

The 2003 Toyota 4Runner should have a small access cover in the lower center portion of the rear door trim panel. Removing this cover will give you access to the rear door lock/latch assembly. It could be that the actuator portion of the assembly has failed in the lock position. You'll need to manipulate the mechanism on the assembly in order to get the latch to release and the door to open. If you need more room to do so, the assist pull strap can be removed followed by the rear door trim panel; this will be difficult in the closed position but possible with minimal damage to the trim panel. I would plan on having a new rear door lock/latch assembly ready for installation as they are rarely fixed via lubrication. Rear gate lock/latch assembly replacement is very similar that of a trunk on a sedan which you can read about here: https://www.yourmechanic.com/article/how-to-replace-a-trunk-lock-actuator-by-michael-france

It's usually the lock that is stuck in lock position.Roll down the window,grab a rubber hammer and as you reach inside and unlock the door,HIT THE DOOR at the locking area with the rubber hammer.Now try to open the door.It may take a few tries but works to open doors 90% of the time.DO NOT lock this door until you have lubed the internal locking mechanical parts and are sure they work.

Won't open from outside? Won't open from inside? Equipped with power door locks? IF so, and won't open inside/outside, suspect stuck power door lock actuator. Sometimes working the lock/unlock button will make the door unlock. If not, the door will require disassembly from inside to determine what the failure may be. If the door needs disassembly while in the closed position, the paneling/clips may get damaged FYI

The servo motor in the door lock may have failed, broke, or disconnected. An Authorized Chevy Dealer should be able to check it.

Open the cover to the door and pull the lock connector mostly rigged steel rods connected to the lock

use a round bar ( a screw driver ) and place it under the latch and pull the latch out as you press the button to unlock as if you were opening the door.

use a round bar under the lock tongue and pull it back as you press the button to open the latch

sounds like you lached the door
use a screw driver or some such tool
lift the outer handle and slip your tool in the middle of the lock hole in the door flip the lach open wile holding handle up

the rear handle gets stuck in the up position..spray with wd40 and work till released..then it will be fine

your gonna have to remove the inner dor panel and replace the latch lock assembly