Admin door doesn't open?

I think the problem is the Click is a function. When using a function like this, the parentheses should contain a word that represents the Player that clicked it. It can be named anything, but for the purposes of demonstration, let's name it "plr".

local Open = false
Admins = "alerttrains123","Player1"
function Click(plr) --plr is the Player who clicked 
    wait()
    if plr.Character:findFirstChild("Humanoid") then --use Character to access the Player's model
        for i = 1,#Admins do
            if plr.Character.Name == Admins[i] then
                if Open == false then
                    Open = true
                    script.Parent.Parent.DoorO1.Transparency = "0"
                    script.Parent.Parent.DoorO2.Transparency = "0"
                    script.Parent.Parent.DoorO1.CanCollide = true
                    script.Parent.Parent.DoorO2.CanCollide = true
                    script.Parent.Parent.DoorC1.Transparency = "1"
                    script.Parent.Parent.DoorC2.Transparency = "1"
                    script.Parent.Parent.DoorC1.CanCollide = false
                    script.Parent.Parent.DoorC2.CanCollide = false
                elseif Open == true then
                    Open = false
                    script.Parent.Parent.DoorO1.Transparency = "1"
                    script.Parent.Parent.DoorO2.Transparency = "1"
                    script.Parent.Parent.DoorO1.CanCollide = false
                    script.Parent.Parent.DoorO2.CanCollide = false
                    script.Parent.Parent.DoorC1.Transparency = "0"
                    script.Parent.Parent.DoorC2.Transparency = "0"
                    script.Parent.Parent.DoorC1.CanCollide = true
                    script.Parent.Parent.DoorC2.CanCollide = true
                    end
                end
            end
        end
    end

script.Parent.ClickDetector.MouseClick:connect(Click)

I hope this helps. If you found my answer helpful, you can upvote and accept it!

You're attempting index your function name?

So yes, it's returning an error, because on line 5 and 7 you're saying 'Click.Parent', but 'Click' is a function value, not a variable.

So, i'm assuming you're attempting to check the player's name to open the door. For this you have to have a Parameter in your function that you're tying to your MouseClick event. Because the MouseClick event returns the player that clicked, then you can index the player through this parameter(:

Secondly, you're trying to define the 'Admins' through a singular variable.. if you do it like that then you will only get access to the first argument. Use a table, then iterate through it to check if they player that clicked is an 'Admin'.

And lastly, the Transparency value takes numbers for arguments, not strings. Take the numbers out of the quotations and then you're good(;

local Open = false
Admins = {"alerttrains123","Player1"} --Made a table

function Click(player) --'player' will be how you acces the player that clicked.
    wait()
    for i,v in pairs(Admins) do --Iterate through the 'Admin' table
        if v == player.Name then  --Check if there's a match
            if Open == false then 
                Open = true
                script.Parent.Parent.DoorO1.Transparency = 0
                script.Parent.Parent.DoorO2.Transparency = 0
                script.Parent.Parent.DoorO1.CanCollide = true
                script.Parent.Parent.DoorO2.CanCollide = true
                script.Parent.Parent.DoorC1.Transparency = 1
                script.Parent.Parent.DoorC2.Transparency = 1
                script.Parent.Parent.DoorC1.CanCollide = false
                script.Parent.Parent.DoorC2.CanCollide = false
            elseif Open == true then
                Open = false
                script.Parent.Parent.DoorO1.Transparency = 1
                script.Parent.Parent.DoorO2.Transparency = 1
                script.Parent.Parent.DoorO1.CanCollide = false
                script.Parent.Parent.DoorO2.CanCollide = false
                script.Parent.Parent.DoorC1.Transparency = 0
                script.Parent.Parent.DoorC2.Transparency = 0
                script.Parent.Parent.DoorC1.CanCollide = true
                script.Parent.Parent.DoorC2.CanCollide = true
            end
        end
    end
end

script.Parent.ClickDetector.MouseClick:connect(Click)