"make it so that when the player presses the E key, his puppet stays very small for 7 seconds, then to use the action again wait for a cooldown of 15 seconds. Use Tweenservice, it is a very complete, complex, large and efficient script!"

-- local script 
local TweenService = game:GetService("TweenService")
local Players = game:GetService("Players")
local player = Players.LocalPlayer
local character
local humanoid
local cooldown = false

local function shrink()
    if not cooldown then
        cooldown = true
        local originalSize = humanoid.RootPart.Size
        local originalScale = humanoid.RootPart.Size / humanoid.RootPart.Size

local smallSize = Vector3.new(0.5, 0.5, 0.5)
        local smallScale = smallSize / humanoid.RootPart.Size

local tweenInfo = TweenInfo.new(0.5, Enum.EasingStyle.Quad, Enum.EasingDirection.Out)
        local tween = TweenService:Create(humanoid.RootPart, tweenInfo, {Size = smallSize})
        tween:Play()

humanoid:SetStateEnabled(Enum.HumanoidStateType.Jumping, false)
        humanoid:SetStateEnabled(Enum.HumanoidStateType.Climbing, false)

wait(7)

local tweenBack = TweenService:Create(humanoid.RootPart, tweenInfo, {Size = originalSize})
        tweenBack:Play()

humanoid:SetStateEnabled(Enum.HumanoidStateType.Jumping, true)
        humanoid:SetStateEnabled(Enum.HumanoidStateType.Climbing, true)

wait(15)
        cooldown = false
    end
end

local function onCharacterAdded(characterInstance)
    character = characterInstance
    humanoid = character:WaitForChild("Humanoid")
end

player.CharacterAdded:Connect(onCharacterAdded)
if player.Character then
    onCharacterAdded(player.Character)
end

local function onKeyPress(actionName, userInputState, inputObject)
    if actionName == "Shrink" and userInputState == Enum.UserInputState.Begin then
        shrink()
    end
end

local contextActionService = game:GetService("ContextActionService")
contextActionService:BindAction("Shrink", onKeyPress, false, Enum.KeyCode.E)