Box custom rig animations won't play

I am trying to make a box animation play thru scripts.

Unfortunately the animation won’t play. I followed roblox docs.

local animator = workspace.BoxWhole.BoxModel.AnimationController.Animator

local closeAnim : Animation = Instance.new("Animation")
closeAnim.AnimationId = "rbxassetid://136211195768388"

local openAnim : Animation = Instance.new("Animation")
openAnim.AnimationId = "rbxassetid://78348468406182"

local closeTrack = animator:LoadAnimation(closeAnim)
local openTrack = animator:LoadAnimation(openAnim)

openTrack:Play()

There are no errors or anything printed in the output.

Here is the explorer view:

image

What can I do?

Maybe try resetting the scale on the model?