When you accept Christ as your savior, not only is the Kingdom of God within reach, it is established residency. Your name is written in the Book of Life. Christ is sitting to the right of God right now, and advocates for us until we get there.
The only 2 people that entered Heaven are Enoch and Elijah. No other human entered Heaven until Christ died for their sins. Those souls remained in Abraham's Bosom, aka Paradise, until Christ retrieved them. It's where Jesus went and took the thief on the cross next to Jesus with Him when they died:
Luke 23:42-43 Then he said to Jesus, “Lord, remember me when You come into Your kingdom.” And Jesus said to him, “Assuredly, I say to you, today you will be with Me in Paradise."