debounce disables script from working?

Looks like you're missing an end

You have two if statements within your function, but only one end!

local debounce = false

script.Parent.Touched:connect(function(hit)
    if not debounce then

        debounce = true

        wait(0.3)
        script.Parent.closeddoors.Transparency = 0
        script.Parent.closeddoors.CanCollide = true
        script.Parent.opendoor1.Transparency = 1
        script.Parent.opendoor2.Transparency = 1
        wait(3)

        if hit.Parent:FindFirstChild('Humanoid') then
            hit.Parent.Torso.CFrame = CFrame.new(-13.084, 122.459, 989.779)
            script.Parent.closeddoors.CanCollide = false
            script.Parent.closeddoors.Transparency = 1
            script.Parent.opendoor1.Transparency = 0
            script.Parent.opendoor2.Transparency = 0
            wait()
            debounce = false
        end
    end
end)

Indenting helps identify issues like these :)