How do you change the color of a brick depending on how long a key is held?

Hello, I am having trouble creating this script. I am trying to make it where if they player is holding down a key, the color of a brick gets darker and darker 4 shades the longer they hold it. However, if they release the key, the brick resets back to its default white color. Its not working correctly for me for some reason. Any ideas?

UserInputService = game:GetService("UserInputService")

local ZKeyPressed = false local building = game.Workspace.b1 local debounce = false local colortable = {game.Workspace.b1} colornumber = 0

UserInputService.InputBegan:Connect(function(input,gameProccesedEvent) if input.KeyCode == Enum.KeyCode.Z then if not debounce then debounce = true ZKeyPressed = true

    end

    while ZKeyPressed == true do wait(0.5) colornumber = colornumber + 1

        print("z pressd")

        for i, v in pairs(colortable)do
            if colornumber == 1 then

                wait(5)
                v.BrickColor = BrickColor.new("Pink")
                if colornumber == 2 then
                    wait(5)
                    v.BrickColor = BrickColor.new("Hot pink")
                    if colornumber == 3 then
                        wait(5)
                        v.BrickColor = BrickColor.new("Magenta")
                        if colornumber ==  4  then
                            wait(5)                 
                            v.BrickColor = BrickColor.new("Eggplant")
                            print(v)
        end




                    end
                end
            end
            end
  end
end

end)

UserInputService.InputEnded:Connect(function(input, gameProccesedEvent) if input.KeyCode == Enum.KeyCode.Z then ZKeyPressed = false do

        print("z releaesed")
        debounce = false
        colornumber = 0 

        for i, v in pairs(colortable)do
            if colornumber == 0 then
                v.BrickColor = BrickColor.new("White")
            end

end
    end
    end
end)