Character Lock-On script not working when finding nearest target?

It will work with a any seperate NPC, But when I try to get it to work while finding the closest NPC in range then it wont work.

local localPlayer = game:GetService("Players").LocalPlayer
local Character = localPlayer.Character
local localRootPart = Character:FindFirstChild("HumanoidRootPart")

local Position1 = localRootPart
local Position2 = nil

function findTarget()
	local Distance = 100
	local Target = nil
	for i, v in pairs(workspace:GetChildren()) do
		local Human = v:FindFirstChild("Humanoid")
		local rootPart = v:FindFirstChild("HumanoidRootPart")
		if Human and rootPart and v ~= Character then
			if Human.Health > 0 then
				if (localRootPart.Position - rootPart.Position).magnitude < Distance then
					Distance = (localRootPart.Position - rootPart.Position).magnitude
					Target = rootPart
				end
			end
		end
	end
	return Target
end

while wait(1) do
	local rootPart = findTarget()
	if rootPart and Position2 == nil then
		Position2 = rootPart
	end
end

function onRenderStepped()
	bodyGyro.CFrame = CFrame.new(Position1.Position, Position2.Position)
end