When I add a wait to my function it doesn't work? and how can I fix it?

Promblem

Hey! I made a script where whenever the player touches a part in the workspace it sets a loop of parts the go behind the players legs. I wanted to add a wait to it but it doesn't work. Why and how can i fix this?

Local Script

local Player = game.Players.LocalPlayer
local char = Player.Character
local root = char.HumanoidRootPart 
walking = false


Player.Character.Humanoid.Running:connect(function(speed)
    workspace.Sand.Touched:Connect(function(hit)
        if hit.Parent:FindFirstChild("Humanoid") then
    if speed == 0 then
    walking = false
        game.ReplicatedStorage.RemoteEvent:FireServer(char,root)
    elseif speed > 0 then
    walking = true
        while wait do
    wait(2)
    if not walking then return end
end
    end
end
    end)
end)


workspace.Sand.TouchEnded:Connect(function()
    walking = false
end)

Server Script

game.ReplicatedStorage.RemoteEvent.OnServerEvent:Connect(function(Player,char,root)
    local Part = Instance.new("Part")
    Part.Parent = workspace
    Part.Anchored = true
    Part.CanCollide = false
    Part.CFrame = root.CFrame * CFrame.new(0,-2,3)
end)