How to disable control of players character?

I have the camera set to scriptable and the character's humanoid Walkspeed set to 0 but I need to have the player walk a certain detection without the players control. I've looked at the wiki and it said to do the following,

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

I made sure to put this in a local script but the player still can control the character when I try to move it.

So how do I do this? I've also tried this,

game.Players.PlayerAdded:connect(function(plr)
	
	plr.DevComputerMovementMode = "Scriptable"
	plr.DevTouchMovementMode = "Scriptable"

end)

But this doesn't seem to do anything. Any help would be much appreciated (: