How to make a sound and tween play simultaneously?

Hi, I am making a spike system for my game that will pop up and go back down. While the spike is popping up, I would like to play a sound effect with it. I made the script to play the tween and sound but the sound is not synced with the playing tween. Here is my code so far:

local Part = script.Parent
local TweenService = game:GetService("TweenService")
local sound = Part.Sound

local StartPos = Part.Position
local Goal = {}
Goal.Position = Vector3.new(StartPos-Vector3.new(0, 80, 0),StartPos)

local tweenInfo = TweenInfo.new(
	1,
	Enum.EasingStyle.Linear,
	Enum.EasingDirection.InOut,
	-1,
	true,
	4
)

local tween = TweenService:Create(Part, tweenInfo, Goal)


tween:Play()

wait(5)
while true do
	sound:Play()
	wait(8)
end

Is it something to do with timing? Or is it something else? Please help me.

You can play the sound when the spike is in a certain position, kinda like this maybe, hope this helps!

local spike = -- your spike thing
local sound = -- your sound

when true do
	if spike.Position >= Vector3.new() then --the position when it's popping up 
		sound:Play
	end
	wait()
end