Roblox Turret Raycast

-- Turret
local part = script.Parent
local function closest()
    local range = 9999
    local target = nil
    for _, v in pairs(game.Workspace:GetDescendants()) do
        if game.Players:FindFirstChild(v.Name) then
            local def = game.Players:FindFirstChild(v.Name)
            if def.Character then
                local JN = def.Character:FindFirstChild("HumanoidRootPart")
                if JN then
                    local dist = (part.Position - JN.Position).magnitude
                    if dist < range then
                        range = dist
                        target = def.Character
                    end
                end
            end
        end
    end
    return target
end

local notTarget = workspace.Target

spawn(function()
    while game:GetService("RunService").Heartbeat:Wait() do
        if closest() and closest():FindFirstChild("HumanoidRootPart") then
            local vroot = closest():FindFirstChild("HumanoidRootPart")
            local direction = (vroot.Position - part.Position).unit * 1000
            local rayset = RaycastParams.new()
            rayset.FilterType = Enum.RaycastFilterType.Blacklist
            rayset.FilterDescendantsInstances = {notTarget}
            rayset.IgnoreWater = true
            local result = workspace:Raycast(part.Position, direction, rayset)
            if result and result.Instance:IsDescendantOf(closest()) then
                part.CFrame = CFrame.lookAt(part.Position, vroot.Position)
            end
        else
            return
        end
    end
end)