Enter The Door Threads

using System;
using System.Collections.Generic;
using System.Threading;

namespace EnterTheDoor
{
    class StartUp
    {
        static readonly object syncObj = new object();

        static void Main(string[] args)
        {
            List<Thread> threads = new List<Thread>()
            {
                new Thread(() => { EnterTheDoor(); }),
                new Thread(() => { EnterTheDoor(); }),
                new Thread(() => { EnterTheDoor(); }),
                new Thread(() => { EnterTheDoor(); }),
                new Thread(() => { EnterTheDoor(); }),
                new Thread(() => { EnterTheDoor(); }),
                new Thread(() => { EnterTheDoor(); }),
                new Thread(() => { EnterTheDoor(); }),
                new Thread(() => { EnterTheDoor(); }),
                new Thread(() => { EnterTheDoor(); })
            };

            threads.ForEach(t => t.Start());
        }

        private static void EnterTheDoor()
        {
            lock (syncObj)
            {
                Console.WriteLine($"Person {Thread.CurrentThread.ManagedThreadId} Passes through the Door");
                Thread.Sleep(2000);
            }
        }
    }
}