no locks on the door

I shall have to do a deal of travelling before I come in sight of your Celestial City. If I arrive late, you'll say a good word for me, won't you, Beth?

Something in the boy's face troubled his little friend; but she said cheerfully, with her quiet eyes on the changing clouds, if people really want to go, and really try all their lives, I think they will get in; for I don't believe there are any locks on that door, or any guards at the gate. I always imagine it is as it is in the picture, where the shining ones stretch out their hands to welcome poor Christian as he comes up from the river.

                                                          Little Women,  Louisa May Alcott