Help practice on this script?

I'm practicing my beginning of scripting with a script that sequences walls to be mostly transparent and being able to walk trough each one going down in descending order. But it stops at the first wall and doesn't continue. What did I do wrong?

local Wall1 = game.Workspace.Wall1
local Wall2 = game.Workspace.Wall2
local Wall3 = game.Workspace.Wall3


wait(4)
Wall1.Transparency = .7
Wall1.Cancollide = false
wait(3)
Wall2.Transparency = .7
Wall2.CanCollide = false
wait(3)
Wall3.Transparency = .7
Wall3.CanCollide = false