how to get zombie to follow closest person?

OK so I have this script and everything looks like it would work, but its doing nothing, there are no errors in the output or anything. the problem is in the findNearestTarget() function, it wont update tar(A Vector3Value). please help!?!?!

local player = script.Parent
local followingPath = false
torso = script.Parent.Torso
range = 500
target = nil

function findNearestTarget()
    for _,plr in pairs(game.Players:GetPlayers()) 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 or (torso.Position-tor.Position).magnitude <= range  then
                    target = plr.Character
                    break
                end
            end
        end
    end
end

while true do
    wait(.1)
    findNearestTarget()
    if target~=nil then
        script.Parent.tar.Value = Vector3.new(target.Torso.Position)
    end
end

while true do

    if not followingPath then
        followingPath = true
    path = game:GetService("PathfindingService"):ComputeRawPathAsync(player.Torso.Position, script.Parent.tar.Value, 500)
    points = path:GetPointCoordinates()

    game.Workspace.Points:ClearAllChildren()

    for p = 1, #points do
        local part = Instance.new("Part")
        part.Size = Vector3.new(1, 1, 1)
        part.Position = points[p]
        part.Anchored = true
        part.CanCollide = false
        part.Parent = game.Workspace.Points
    end

    for _, point in pairs(points) do
        script.Parent.Zombie:MoveTo(point)
        repeat
            distance = (point - player.Torso.Position).magnitude
            wait()
        until distance < 3
    end
    followingPath = false
    end
    wait(0.1)
end