Well this happened on Cinco De Mayo. I was standing out by my truck waiting on some people to hurry up and I flipped the lock into the locked position just messing around. Unfortunately, the lock got stuck in the locked position and would not budge. Fast forward to two days ago, I was looking at it again (I hadn't had time to get it fixed) I locked the driver side to see if it would do the same thing. Anddddd it did. So I got to looking around online for a fix.
Here was the solution. This video was exact to our trucks.
Stuck, Jammed Child Lock Toyota Tundra. How To Fix Solution. - YouTube
To get the door lock out. You will need a T-30 Torx bit.
Here is the lock assembly removed from the door.
There's a little flap on the front side, Open that up and you will see this.
Where the cable connects, just wiggle it around a bit, and it freed mine up. Close the flap up, and put it all back together.