Factory alarm

I have a 2005 4Runner SR5.

Set the alarm with the key fob with the windows down, just like the owners manual says too do. I wait for the security light to began flashing on the dash, reach in to unlock and open the door from the inside, just like the manual says. No alarm?? Interior dome light coms on, gage cluster shows doors ajar light, and security light is still flashing?? ( still armed )?? Why won’t the alarm go off??

Any help would be appreciated!

 

Shot in the dark here. Where's your key fob when you're doing this? Could it be recognizing it? I don't know. Just thinking out loud.