Limit of a move for position

i used transform.position for change the position, but i dont wanna that the player move if have a object in desired position 3d game

 void Update()
 {
   if (Input.GetKeyDown(KeyCode.UpArrow))
         {
             transform.position += new Vector3(-67, 0, 0);
             
         }
         if (Input.GetKeyDown(KeyCode.DownArrow))
         {
             transform.position += new Vector3(67, 0, 0);
             
         }
         if (Input.GetKeyDown(KeyCode.LeftArrow))
         {
             transform.position += new Vector3(0, 0, -56);
            
         }
         if (Input.GetKeyDown(KeyCode.RightArrow))
         {
             transform.position += new Vector3(0, 0, 56);
             
         }
      }