private static object obj = new object();
        static void Main(string[] args)
        {
            Thread.Sleep(1000);
            Task.Run(async() =>
                {
                    Monitor.Enter(obj);
                    await Task.Delay(3000);
                    Console.WriteLine("2");
                    Monitor.Exit(obj);
                }
            );
            Thread.Sleep(1000);
                Monitor.Enter(obj);
                Console.WriteLine("sd");
                Monitor.Exit(obj);
}