Can anyone help me with my alien script?

So i looked up a tutorial on how to make a zombie script and used it for a custom alien i made it detects the player but it doesn't move any help? heres the script so you can see it:

torso = script.Parent.Torso
range = 20
target = nil

function findNearestTarget()
    plrs = game.Players:GetChildren()
    for i, plr in ipairs(plrs) do
        if plr.Character ~= nil then
            tor = plr.Character.Torso
            if target ~= nil then
            if (torso.Position-tor.Position).magnitude < (torso.Position-target.torso.Position).magnitude then

                break
            end 

            elseif (torso.Position-tor.Position).magnitude <= range then
print(plr.Name.."is in range")  
break       
                end
            end
        end
    end

while true do
    wait(.1)
    findNearestTarget()
    if target ~= nil then
        script.Parent.Alien:MoveTo(target.Torso.Position)
    end
end