Warning: Be sure the test the key's ability to twist with the same force to turn an actual key, BEFORE you insert it into the ignition of any forklift. Failing to do so, could lead to a key breaking in the ignition.
With that said, I was bored on my forklift, so at lunch I took out the digital calipers and took 24 measurements (not including the bow's jacket). When I got home, I used the measurements to build the key on TInkerCAD. With my settings you print a key up in 23 minutes.
I used white Hatchbox PLA to make the key on my Creality CR-10s, and spent all weekend (6-15 until 6-17) torturing 4 prints to see how far I can take them to their breaking point. Knowing this, I was confident the key wouldn't break in the ignition.
I have included videos to show the key does indeed work on Yale stand up and sit down, electric forklifts.
Video 1: https://www.facebook.com/100010892229605/videos/pcb.1663532500434115/592662347773501/?type=3&theater&ifg=1
Video 2: https://www.facebook.com/100010892229605/videos/pcb.1663532500434115/592662781106791/?type=3&theater&ifg=1
It is extremely important to print this at 100% infill for strength, and leave the key's orientation on your bed alone.
Nozzle temp was 200 C and Bed Temp was 62 C.
Use Lines on top and bottom, Concentric will leave little gaps on the top layer.