Small queue system

Queues.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace TestTestTest
{
    class Program
    {
        static Queue Users = new Queue();
        static Queue Photos = new Queue();

        static void Main(string[] args)
        {
            Users.Push((int)1);

            while (true) 
            {
                System.Threading.Thread.Sleep(1);
                Execute();
            }
        }

        static bool isON = true;
        static void Execute()
        {
            object o = Users.Pop();

            if (o != null) InvokeMethod((int)o + 1, (n) => {
                Console.WriteLine(o.ToString() + " - " + Users.Objects.Count);
                Users.Kill();

                for (int i = 0; i < 10; i++ ) 
                {
                    if (Users.Objects.Count > 10000) isON = false;
                    if (isON) Users.Push(Users.Objects.Count);
                }
            });
        }

        static void InvokeMethod(int next, Action<int> Done) 
        {
            Done(next);
        }
    }

    public class Queue {

        public List<object> Objects;

        public Queue() 
        {
            Objects = new List<object>();
        }

        public void Push(object o) 
        {
            Objects.Add(o);
        }

        public object Pop() 
        {
            if (Objects.Count > 0) return Objects[0];
            return null;
        }

        public void Kill() 
        {
            if (Objects.Count > 0) Objects.RemoveAt(0);
        }

    }
}