Removing control with ControllerService?

local controllers = {}

function removeControl()
    for _, controller in pairs(game:GetService("ControllerService"):GetChildren()) do
		 controller.Parent = nil  
		table.insert(controllers, controller)             
    end
end

function resumeControl()
    for _, controller in pairs(controllers) do
        controller.Parent = game:GetService("ControllerService")
    end
    controllers = {}
end

When I call the function 'removeControl()', it does nothing. Same as resume control, these are in a localscript, too. Any idea on how to fix these? I need them for my cutscene!