Unity super simple object pool

public class PoolMgr
    {
    
        private static PoolMgr instance;
        public static PoolMgr Instance
        {
    
            get
            {
    
                if (instance==null)
                {
    
                    instance = new PoolMgr();
                }
                return instance;
            }
        }

        private Dictionary<string, Queue<GameObject>> pools = new Dictionary<string, Queue<GameObject>>();

        private Transform poolObj;

        public void Push(GameObject obj)
        {
    
            obj.name = obj.name.Replace("(Clone)",string.Empty);

            if (!pools.ContainsKey(obj.name))
            {
    
                pools.Add(obj.name,new Queue<GameObject>());
            }

            if (!poolObj)
            {
    
                poolObj = new GameObject("Pools").transform;
            }

            Transform objParent = poolObj.Find(obj.name);
            if (!objParent)
            {
    
                objParent = new GameObject(obj.name).transform;
                objParent.SetParent(poolObj);
            }

            obj.transform.SetParent(objParent);

            pools[obj.name].Enqueue(obj);

            obj.SetActive(false);
        }

        public GameObject GetObj(GameObject obj)
        {
    
            if (!pools.ContainsKey(obj.name) || (pools.ContainsKey(obj.name)&& pools[obj.name].Count == 0))
            {
    
                GameObject temp =   GameObject.Instantiate(obj);
                Push(temp);
            }

            GameObject result = pools[obj.name].Dequeue();
            result.SetActive(true);

            return result;
        }
    }