How can I make a part change materials after a certain amount of seconds?

I need a script to help me do this! I'm trying to make a pathway of footsteps light up one step at a time. A script that could be used for each part would be great!

while true do
wait(0.1) --- your time here 
workspace.YourPartsName.Material = ---Whatever material you wanna put here
wait(0.5) --- again, your time here
workspace.YourPartsName.Material = 
end

or something along those lines

-->Put this into the Part to work

local part = script.Parent

while true do
	wait(1) --> You decide your time of waiting
	part.Material = Enum.Material.Plastic -->Change this to your own Material
	wait(1) --> Change this
	part.Material = Enum.Material.Nenon -->Change this to your own Material
end

--> This is all you need