How i pause the Tweening?

In the Script, with you hold E, a Power Bar start to fill, but i don't know how to Pause the Tweening when the Player stops hold E.

Script:

Ok = false

function SubirForca(inputObject, gameProcessedEvent)
    if inputObject.KeyCode == Enum.KeyCode.E then
        Ok = true
        if Ok == true then
            script.Parent.Forca:TweenSize(UDim2.new(0, 200, 0, 20), "Out", "Linear")
			print("Subindo barra de força")
        end
    end
end

game:GetService("UserInputService").InputBegan:connect(SubirForca)
	
function ManterForca()
	Ok = false
	print("Força mantida")
end

game:GetService("UserInputService").InputEnded:connect(ManterForca)

Don't think you can unless you use some knowledge like:

if Ok == false then
	script.Parent:TweenSize(UDim2.new(0, 0, 0, 0), "InOut", "Linear", .5)
end

For more info, read: http://wiki.roblox.com/index.php?title=API:Class/GuiObject/TweenSize