He will sweat, but that will make his rest all the more enjoyable. He will have sorrow, but he will also not starve, he will have bread. The serpent is sentenced to eat dust, but Adam will eat the herb of the field. Lastly, his life is now short. Dust you are.
Man is but dust, a frail creature, and now also a mortal and dying creature.
Sin brought death into the world. So much for the long review of some key elements of Genesis 3. I have done this, because as I recently studied this passage, I was amazed at how grace and mercy was so evident from the start of God's dealings with Adam after his rebellion. God is a merciful God. And we need to remember how willing He is to forgive and reclaim us when we do not follow His will.