Treasure in heaven is the building of the kingdom of heaven here and now, our character determines what we do, the closer we walk with our Savior, the more our character becomes like His, the more we yield our will to His, the more He can work through us to accomplish His purpose, when we cooperate with his Spirit , we are empowered in amazing ways.
He has called each of us for an awesome purpose, however only those who, through a life of submission and obedience to his will, become vessels fit for the Masters use.
the works He does through us IS the treasure, the reward now is peace, true joy, and ultimate security, knowing that whatever happens around us or to us, He will NEVER leave us nor forsake us ... never.