The Key to Heaven is Jesus Christ, and giving your heart to Him. Jesus Christ is also the King to the Kingdom. In order to have the full abundance of life that God promised is to Give yourself fully to Jesus. He loves you more than anything else, the sooner that you allow Him into your heart, then you will feel the love that only Jesus can give to you.

Matthew 16:9
I will give you the keys of the kingdom of heaven; whatever you bind on earth will be [ Or have been] bound in heaven, and whatever you loose on earth will be [ Or have been] loosed in heaven.”

-Patricia Denman