Oooh, have fun with that. I had that issue, my key holder snapped and fell inside holding the locking mechanism from moving.
I had to crawl in the back, and genty pry out the weather stripping, then take out the strap screw, then pull off the cover (it's a PIA with the door closed).
Then i could get to the inside of the door to work on it.

Good luck!
Greg

89 4Runner
3" BL, M/T locks, 33"bfg mt, bilstein, Kayline, tubebumper, toyotafiberglass panels
TBI: Elocker,3.4 w/ORS,b+b,S2Sstg2cams,arias pistons,P+P intake,TRDs/c,URDpullies+7th,downey headers,MAPECU2,WEGO WB, SupraMAF,walboro255,stg4clutch, EPaOo2 sim