How come this sitting detector does not function?

--Variables
local seat = script.Parent
local debounce = true
local enabled = false



--Script
local function onTouch(Part)
    if debounce and Part.Parent:FindFirstChild("Humanoid") then
        if Part.Parent.Humanoid.Sit == true then
            debounce = false
            print(Part.Parent, "is sitting")

            wait(0.1)

            debounce = true
        end
    end
end

seat.Touched:Connect(onTouch)

Can someone explain why if Part.Parent.Humanoid.Sit == true then doesn't work?