Heaven is not the only benefit of serving the Lord. There are additional benefits such as: a hedge (wall of fire) around us, blessings of God on our works, the name of Jesus and His blood as a weapon, angels of God to guide us, Holy Spirit with His 7 fold duties (helper, strengthener, standby ...). The word of God and your faith. Put them to work, there will be testimonies. Job 1 v 10.