Change walkspeed on touched event?

Ok so basically i made a teleporting pad and rigged up with it is a gui that would cover the player's screen while teleporting, and i also want make it so the player can't move , i've tried but for some reason it just won't work

Here's the code

local tpTo = "TP2"
local Players = game:GetService('Players')
	 
script.Parent.Touched:connect(function (hit)
	    if hit.Parent:FindFirstChild('Humanoid') then
	       	local char = hit.Parent
	        
	        if Players:FindFirstChild(char.Name) then
		
	            local plr = Players:FindFirstChild(char.Name)
	            local gui = plr.PlayerGui.questchat.Teleport
				local human = hit.Parent.Humanoid
	
	            gui:TweenSize(UDim2.new(1,0,1,0),Enum.EasingDirection.Out,Enum.EasingStyle.Quint,0.25)
		            
		wait(0.25)
		       
			 if script.Parent.Locked == false and script.Parent.Parent:FindFirstChild(tpTo).Locked == false then
                 
				script.Parent.Locked = true
				script.Parent.Parent:FindFirstChild(tpTo).Locked = true
				local pos = script.Parent.Parent:FindFirstChild(tpTo)
				human.WalkSpeed = 0
				char:moveTo(pos.Position)	
				script.Parent.Locked = false
				script.Parent.Parent:FindFirstChild(tpTo).Locked = false		
			end
				
				gui:TweenSize(UDim2.new(0,0,0,0),Enum.EasingDirection.In,Enum.EasingStyle.Quint,1)
				human.WalkSpeed = 16

	        end	
	    end	
end)

Anything GUI related, put it under an OnClientEvent of RemoteEvent, and fire the remote to the client. You’re trying to modify PlayerGui on the server, which is a big no no.

Remote.OnClientEvent:Connect(function()
    -- localscript, put your tween position code here.
end)

Server script with your touched event:

Remote:FireClient(plr)