NPC Follow script problem, How do i make it so that the npc stops at 5 studs away from me ?

And that it starts to follow only if the player hits him (optional)

function findNearestPlayer(Position)
    wait(0.3)
    local List = game.Workspace:children()
    local Torso = nil
    local Distance = 30
    local Temp = nil
    local Human = nil
    local Temp2 = nil
    for x = 1, #List do
        Temp2 = List[x]
        if (Temp2.className == "Model") and (Temp2 ~= script.Parent) then
            Temp = Temp2:findFirstChild("HumanoidRootPart")
            Human = Temp2:findFirstChild("Humanoid")
            if (Temp ~= nil) and (Human ~= nil) and (Human.Health > 0) then
                if (Temp.Position - Position).magnitude < Distance then
                    Torso = Temp
                    Distance = (Temp.Position - Position).magnitude
                end
            end
        end
    end
    return Torso
end




while true do
    local target = findNearestPlayer(script.Parent.HumanoidRootPart.Position)
    if target ~= nil then
        script.Parent.Humanoid:MoveTo(target.Position, target)
    end
end