how can i make a part that becomes visible every 25 seconds?

hello. i am trying to make a script that makes a transparent part visible when a 25 seconds timer hits 0 but it doesn't work. this is my script:

local timer = game.Workspace.Timer.SurfaceGui.TextLabel
local part = game.Workspace.saracie
while true do
	if timer.Text == "25" 
	then
		part.Transparency = 1
	else
		if timer.Text == "0" then
			part.Transparency = 0
wait(3)
part.Transparency = 1

		end
		end
	
	end
		
	

local PartInvis = false 

while true do 
	if Partinvis == true then
		part.Transparency = 0
		PartInvis = false

                else
		Part.Transparency = 1
		PartInvis = true
	end
 wait(25)
end

All that's happening is this while loop will continuously run, but will pause for 25 seconds after running the code before running it again. The PartInvis is only used to determine whether at the time the code is running the part is transparent.

I didn't really understamd what you were saying, but anyway, here's a script that makes the part disappear every 25 seconds. Let me know if this helps. :)

Part=script.parent
Part.Transparency=0
Part.CanCollide=true

while true do
	Part.Transparency=1
	Part.CanCollide=false
	wait(25)
	Part=script.parent
	Part.Transparency=0
	Part.CanCollide=true