 One of them, the door between the holy place and the most holy place, was actually a thick curtain barring access to the glory of the God of Israel. When Jesus died on the cross, that barrier split open. His death allows us to enter unhindered to the throne of grace, to find grace and mercy to help in time of need. We don't need a rocket to blast us to heaven. We simply go through the door opened by him who said in John 10, 7, I am the door.