Coroutine not returning value on yield

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I am attempting to create an NPC module which calls a coroutine function to search for targets close to it, outside of its state machine. Though for some reason I’m not sure of, it only returns ‘true’, even when targets are detected.

function GetTarget(NPC)
	return coroutine.wrap(function()
		local Dist = 100
		local Target = nil
		
		local RootPart = NPC:FindFirstChild("HumanoidRootPart")
		
		repeat wait(1)
			for i,v in pairs(workspace.Characters:GetChildren())do
				local Humanoid = v:FindFirstChild("Humanoid")
				local TargetRoot = v:FindFirstChild("HumanoidRootPart")

				if Humanoid and TargetRoot then
					local Distance = (RootPart.Position - TargetRoot.Position).Magnitude

					if(Distance < Dist) then
						Target = TargetRoot
						Dist = Distance
					end
				end
			end
		until Target
		
		coroutine.yield(Target)
	end)
end

function module:StateMachine(NPC)
	local taskCoro = coroutine.create(GetTarget)
	local Target = coroutine.resume(taskCoro, NPC)
	
	while wait(1)do
		print(Target)
	end
end

Any ideas why?