Detect Player When Near Door?

I'm using Region3 for this this door that I'm creating. The door opens perfectly fine when the player is inside the region. When it comes to closing it, I'm having a lot of trouble. How would I go about seeing if there are no players in the region?

Here's a general gist of the code opening the door

local region = Region3.new(pos1, pos2)

while true do
	wait(1)
	local partsInRegion = game.Workspace:FindPartsInRegion3(region, nil, math.huge)
	local playersFound = {}
	
	for _, part in pairs(partsInRegion) do
		if part.Parent:FindFirstChild("Humanoid") ~= nil then
			print("PLAYER!")
			playersFound[part.Parent.Name] = part.Parent
		end
	end
	
	for plrName, char in pairs(playersFound) do
		if char then
			if opened == false then
				Door1Open:Play()
				wait(openWait)
				opened = true
			end
		end
	end
end

I think it would be easier if Player:DistanceFromCharacter() was used.

I would go about it like this

local function GetPlayersInDistance(vec, dist)
	local players = {}
	for name, player in pairs(game:GetService("Players"):GetPlayers()) do
		if player.Character and typeof(vec) == "Vector3" and type(dist) == "number" then
			local dis = player:DistanceFromCharacter(vec)
			if dis <= dist and dis > 0 then
				table.insert(players, player)
			end
		end
	end
	return players or {}
end

-- Example for returning a table of all players, 50 distance from door.Position (vector3)
local distance = 50
local nearby = GetPlayersInDistance(door.Position, distance)