If then else statement not working?

I'm trying to make a Gate and it's going pretty well, and it works well too, however, the problem is the debounce variable I've set up for it is not working.

Button.MouseClick:Connect(function()

if DoorDebounce == false then
        DoorDebounce = true 
        if DoorIsUp then
            Door.Anchored = false
            print("Door is lowering")
            DownTween:Play()
            Door.Anchored = true
            DoorIsUp = false
        else
            Door.Anchored = false
            print("Door is opening")
            UpTween:Play()
            DoorIsUp = true
            Door.Anchored = true
        end
        DoorDebounce = false 
    end

end)

What am I doing wrong?