How to make an NPC Following script with radius?

Its simple, and probably a LOT of people can do it, but iv never tried this before considering iv been scripting for how long now? years. So i have tried this...

(script inside NPC)

--something that detects a player WITHING A RADIUS!!:Connect(function(c)
script.Parent.Humanoid:MoveTo(c.HumanoidRootPart.CFrame  - radius )--i dont want NPC going directly towards player
end)

Any help is appreciated :)

Please Help

Omg im sooo sorry but it didnt work, i tried

wait(1)
follow = false
Character = game.Workspace:FindFirstChild(game.Players.LocalPlayer.Name)

while true do
 if game.Players.LocalPlayer.Character.HumanoidRootPart ~= nil then
  if game.Players.LocalPlayer.Character.HumanoidRootPart.Position.X - game.Workspace.NPC.HumanoidRootPart.Position.X <= 10 then
   follow = true
  end
 end

 if follow == true then
  game.Workspace.NPC.Humanoid.WalkToPoint = game.Players.LocalPlayer.Character.HumanoidRootPart.Position
 end
 wait(.5)
end

The (unanchored) person named NPC does not follow me...

You could get the nearest player by using tables and the table.sort() method:

local SearchDistance = 10000

local NPC = script.Parent
local HRP = NPC.HumanoidRootPart
local Humanoid = NPC:FindFirstChildOfClass("Humanoid")

local function getNearestPlayer()
	local playerDistances = {}
	if HRP then 
		for i, player in pairs(game.Players:GetPlayers() do 
			-- get the distance between the player's character and the HRP's position
			local distance = player:DistanceFromCharacter(HRP.Position)
			-- 'table.insert(x, y, z)' has 3 arguments. x = table(array), y = number position (optional), z = variable/object/instance your adding to the table
			table.insert(
				playerDistances,
				{
					player,
					distance
				{
			)
		end
	end
	if #playerDistances >= 1 then 
		--'table.sort(x, y)' has 2 arguments. x = table(array), y = function (optional)
		table.sort(
			playerDistances,
			function(a, b) -- 'a' and 'b' is the data/table inserted into the 'playerDistances' table
				-- we are comparing the distances and ordering them from least to greatest
				-- so we get the data's second value 'a[2]' and 'b[2]' which is the distances
				return a[2] < b[2]
			end
		)
		for i, dataTable in pairs(playerDistances) do  
			local player = dataTable[1]
			local distance = dataTable[2]
			if player and distance then 
				-- 'i' is the number position of the 'dataTable'
				if i == 1 and distance < SearchDistance then 
					return player
				end
			end
		end
	end
end

while HRP and Humanoid.Health > 0 do 
	wait(1)
	local nearestPlayer = getNearestPlayer()
	if nearestPlayer then 
		print("player nearby:", nearestPlayer)
	end
end

Now with this you can figure out to stop the NPC from going over the radius. I have to go rn, attempt it and if you need any help leave a comment.

wait(1)

--variables 
follow = false
Character = game.Workspace:FindFirstChild(game.Players.LocalPlayer.Name)

while true do
 if game.Players.LocalPlayer.Character.Humanoid.RootPart ~= nil then
  if game.Players.LocalPlayer.Character.Humanoid.RootPart.Position.X - --finds the character's position
game.Workspace.[NPCNAME].Humanoid.RootPart.Position.X <= 10 then --determines if the npc is within the 10 radius 
   follow = true --if you're in the radius it will follow you
  end
 end
 
 if follow then
  game.Workspace.[NPCNAME].Humanoid.WalkToPoint = game.Players.LocalPlayer.Character.Humanoid.RootPart.Position --this just tells the npc to walk towards you/ tells what 'following' will do
 end
 wait(.5)
end?

--Change the "NPCNAME" to your NPC's name of course --Good luck