Best way to add a debounce to this opening door script?

The easiest way to add a debounce is to do the check if the debounce is true after the function starts, immediately set it to false after, and then set it back to true the line before the end for that check.

local door = script.Parent
local main = door.Main
local button = script.Parent.MainDoor
local debounce = true

local open = false
button.ClickDetector.MouseClick:Connect(function()
    if debounce == true then
        debounce = false
        if not open then
            open = true
            for i = 0, 10, 0.3 do
                door:SetPrimaryPartCFrame(door:GetPrimaryPartCFrame()
                * CFrame.Angles(0, math.rad(math.pi*-0.85), 0))
                wait()
            end
        else
            open = false
            for i = 0, 11, 0.3 do
                door:SetPrimaryPartCFrame(door:GetPrimaryPartCFrame()
                * CFrame.Angles(0, math.rad(math.pi*0.80), 0))
                wait()
            end 
        end
        debounce = true
    end
end)

I imagine a boolean would be simple

local door = script.Parent
local main = door.Main
local button = script.Parent.MainDoor

local open = false
local opening = false

button.ClickDetector.MouseClick:Connect(function()
    if opening then return end
    opening = true
    -- Your whole script here
    opening = false
end)