Can I get help with a toggling clickdetector button script? (No Errors in Output)

So I have a script where when you click it changes a bool value and is supposed to change whether something is visible or not yet it isn't working I tried both else if and elseif --code end but both aren't working, any help?

Discord: Unknown Intelligence#6569

local bool = false
script.Parent.ClickDetector.MouseClick:Connect(function()
    local shield = script.Parent.Parent.Part
    if bool == false then
    shield.Transparency = 1
    shield.Transparency = false
    bool = true
    else if bool == true then
    shield.Transparency = 0
    shield.CanCollide = true
    bool = false
end
end
end)

Using elseif:

local bool = false
script.Parent.ClickDetector.MouseClick:Connect(function()
    local shield = script.Parent.Parent.Part
    if bool == false then
    shield.Transparency = 1
    shield.Transparency = false
    bool = true
    elseif bool == true then
    shield.Transparency = 0
    shield.CanCollide = true
    bool = false
end
end)