How to make an Iris opening door

I’m trying to make an iris opening door but I’m running into two issues. If I use Add Local Rotation, the three door pieces will rotate at a crazy speed for the duration of the timeline instead of the 90 Degrees I’ve entered, they also don’t reverse when I hit the button again and instead rotate forward again. And if I use Set Relative Rotation, the door pieces then teleport to another spot and then work normally.

What am I missing?