Running/Sprinting Script help?

Hello. I am making a running script where when you hold down "e" it will start running faster. Here is my first script which is when you press "e" you will run,

local mouse = game.Players.LocalPlayer:GetMouse()
local running = false

mouse.KeyDown:connect(function(key)
    key = string.lower(key)
    if string.byte(key) == "e" then
        running = true
        local keyCon = mouse.KeyUp:connect(function(key)
            if string.byte == "e" then
                running = false
            end
        end)
        script.Parent.Humanoid.WalkSpeed = 25
        repeat wait() until running == false
        keyCon:disconnect()
        script.Parent.Humanoid.WalkSpeed = 16
    end
end)

Here is another script that gives the script above to the player whenever he or she dies.

game.Players.ChildAdded:connect(function()
end)

game.Workspace.ChildAdded:connect(function(newPlayer)
    local h = newPlayer:FindFirstChild("Humanoid")
    if h ~= nil then
        if workspace:FindFirstChild(h.Parent.Name) ~= nil then
            local run = script.Parent:clone()
            if workspace.FindFirstChild(h.Parent.Name) ~= nil then
                run.Parent = h.Parent
                run.Disabled = false
            end
        end
    end
end)

I was just wondering if these 2 scripts were right. Thank you. :D