How do I make this script work with walls with a certain name?

local player = game.Players.LocalPlayer
player.CharacterAdded:wait()
local character = player.Character
local torso = character:WaitForChild("Torso")
local mouse = player:GetMouse()
local humanoid = character:WaitForChild("Humanoid")

local lastwall = nil
mouse.KeyDown:connect(function(key)
	if string.byte(key) == 48 then
	local ray = Ray.new(
		torso.CFrame.p, torso.CFrame.lookVector *2
	)
	local hit, position, normal = workspace:FindPartOnRay(ray, character)
	
	if hit then
		if hit ~= lastwall then
			local velo = Instance.new("BodyVelocity",torso)
			velo.MaxForce = Vector3.new(300000,300000,300000)
			velo.Velocity =  -torso.CFrame.lookVector*40 + Vector3.new(0,50,0)
			game.Debris:AddItem(velo,0.1)
			lastwall = hit
			wait(.5)
			lastwall = nil
		end
	end
end
end)