?Help, Gui pops up instantly again when script finishs

I want my script to wait before you can "Talk" to the NPC again. The script i am going to be showing you is making the GUI visible. I need it so it dosent go instantly when you stay on again when the script finishes. off

local debounce = false

function getPlayer(humanoid) 
local players = game.Players:children() 
for i = 1, #players do 
if players[i].Character.Humanoid == humanoid then return players[i] end 
end 
return nil 
end 

function onTouch(part) 

local human = part.Parent:findFirstChild("Humanoid") 
if (human ~= nil) and debounce == false then

debounce = true

local player = getPlayer(human) 

if (player == nil) then return end 

script.Parent:clone().Parent = player.PlayerGui
wait(8)
debounce = false
player.PlayerGui.Chatbox1:remove()
wait(3)
debounce = false
wait(5)
end
end


script.Parent.Parent.Touched:connect(onTouch) 

Thank you!