How do I make my door only open once on Touched and play sound only once?

Hello, I have a secret/trapdoor that is intended to open when I click on, or touch (with my player) a book on a nearby shelf. When I click the book, everything works perfectly as intended. However, when I stand on the book, move left to right on the book, etc. the sound plays multiple times, sometimes the door opens only for a short moment and closes quickly again, and overall it just doesn't work as intended.

I'm sorry if my code looks poor, I am very new to programming and have been trying my best to figure this all out. Can anybody help me out with this?

In the past I have tried to add debounce but I didn't seem to do it correctly, if that is what I need here.

Here is the full script:

local Sound = game.Workspace.Map.Level1.BookTrapdoor.Trapdoor.DoorOpening
local BookSwitch = game.Workspace.Map.Level1.BookTrapdoor.BookSwitch.Button
local Trapdoor = game.Workspace.Map.Level1.BookTrapdoor.Trapdoor
local ClickDetector = game.Workspace.Map.Level1.BookTrapdoor.BookSwitch.ClickDetector

COOLDOWN = false
COOLDOWN_TIME = 3

ClickDetector.MouseClick:Connect(function()
    if COOLDOWN == false then
        COOLDOWN = true
    end
    Sound:play()
    Trapdoor.Transparency = 0.8
    Trapdoor.CanCollide = false
    ClickDetector.MaxActivationDistance = 0
    wait(COOLDOWN_TIME)
    Trapdoor.Transparency = 0
    Trapdoor.CanCollide = true
    ClickDetector.MaxActivationDistance = 10
    COOLDOWN = false
    wait()
end)

BookSwitch.XPart.Touched:Connect(function()
    if COOLDOWN == false then
        COOLDOWN = true
    end
    Sound:play()
    Trapdoor.Transparency = 0.8
    Trapdoor.CanCollide = false
    ClickDetector.MaxActivationDistance = 0
    wait(COOLDOWN_TIME)
    Trapdoor.Transparency = 0
    Trapdoor.CanCollide = true
    ClickDetector.MaxActivationDistance = 10
    COOLDOWN = false
    Sound.Ended(wait)
end)