Hmmm...never had that problem with my 4Runners.

No, there is no secret way to unlatch it.

Sounds stupid, but make SURE its unlocked. Hit the unlock a few times and try again.

If not, your only option will probably be to remove then panel and try to get at the latch from the inside, and pop it loose with a screwdriver.

88 4R, 350 V8, R150 5 speed Sold <...uot; />
97 4R, stock, daily driver
98 Sienna, kid and dog hauler, wife's ride