Why doesn't the script fade-in a part?

Hey. I'm trying to make a part smoothly fade-in but for some reason this does not work. Any ideas why? Here's the code:

local T = script.Parent
local trans = T.Transparency

while true do
	wait(5)
	trans = trans + .1
end

You can try the following. If it doesn't work, tell me the output.

local T = script.Parent
local trans = T.Transparency
	 
for i = 0,1,0.1 do
	wait(5)
	trans = i
end

That is because you are creating a variables. Here is one method you can use to solve this issue.

-- Variables

local Part = script.Parent -- The part we are going to fade - in

-- Values

local Duration = 10 -- How many seconds it takes to fade in

-- Functions

local function FadeIn() -- Function to Fade In
	local Start = tick() -- This is when the function was called
	
	while true do -- Loop
		local Now = tick() -- Get the current time
		local Difference = math.clamp(Start - Now, 0, Duration) -- Calculate how many seconds has passed
		local Ratio = (Difference / Duration) -- Get a percentage
		
		Part.Transparency = (1 - Ratio) -- Set the transparency
		
		wait() -- Small delay so that studio doesn't crash
	end
end

local function FadeOut() -- Function to Fade Out
	local Start = tick() -- This is when the function was called
	
	while true do -- Loop
		local Now = tick() -- Get the current time
		local Difference = math.clamp(Start - Now, 0, Duration) -- Calculate how many seconds has passed
		local Ratio = (Difference / Duration) -- Get a percentage
		
		Part.Transparency = Ratio -- Set the transparency
		
		wait() -- Small delay so that studio doesn't crash
	end
end

-- Misc

while true do
	FadeOut()
	
	wait(1)
	
	FadeIn()
end