How to check if a part is not being touched by anyone?

Hi! So I made this sliding door in my game and I think it works pretty well, but there is one problem. The door shuts in your face if you stay there for too long. I need it to stay open when a player touched it, and only close when nobody is touching it. I want to know how to check if my detector is not being touched, so it doesn't shut on anyone's face. Is there any piece of script that I could use for this? Preferably something that can be used in a if statement? If not then are there any other ways I could avoid this problem? Help is much appreciated. Thanks!

p.s. If you need the code here it is:

local TweenService = game:GetService("TweenService")
local Door1 = script.Parent:WaitForChild("Door1")
local Door2 = script.Parent:WaitForChild("Door2")
local tweeningInformation = TweenInfo.new(  
    0.5,
    Enum.EasingStyle.Linear,
    Enum.EasingDirection.Out,
    0,
    false,
    0
)
local Door1Open = {CFrame = CFrame.new(29.706, 4.155, -47.327)}
local Door2Open = {CFrame = CFrame.new(29.706, 4.155, -30.987)}
local Door1Close = {CFrame = CFrame.new(29.706, 4.155, -41.823)}
local Door2Close = {CFrame = CFrame.new(29.706, 4.155, -36.487)}
local Tween1Open = TweenService:Create(Door1,tweeningInformation,Door1Open)
local Tween1Close = TweenService:Create(Door1,tweeningInformation,Door1Close)
local Tween2Open = TweenService:Create(Door2,tweeningInformation,Door2Open)
local Tween2Close = TweenService:Create(Door2,tweeningInformation,Door2Close)

local dooropen = false

script.Parent.Detector1.Touched:Connect(function()
    if dooropen == false then
    dooropen = true
    Tween1Open:Play()
    Tween2Open:Play()
    wait(2)
    Tween1Close:Play()
    Tween2Close:Play()
    dooropen = false
    end
end)

script.Parent.Detector2.Touched:Connect(function(hit)
    if dooropen == false then
    dooropen = true
    Tween1Open:Play()
    Tween2Open:Play()
    wait(2)
    Tween1Close:Play()
    Tween2Close:Play()
    dooropen = false
    end
end)