Luke 13:24-27 & Revelation 22:16-17

Luke 13:24-27

Make every effort to enter through the narrow door, because many, I tell you, will try to enter and will not be able to. Once the owner of the house gets up and closes the door, you will stand outside knocking and pleading, 'Sir, open the door for us.' But he will answer, 'I don't know you or where you come from.' Then you will say, 'We ate and drank with you, and you taught in our streets.' But he will reply, 'I don't know you or where you come from. Away from me, all you evildoers!' "


Revelation 22:16-17
" 'I, Jesus, have sent My angel to testify to you these things for the churches I am the root and the descendant of David, the bright morning star.' The Spirit and the bride say, 'Come'. And let the one who hears say, 'Come'. And let the one who is thirsty come; let the one who wishes take the water of life without cost. "

So the first scripture here says "many ... will try to enter and will not be able to". However, the second one says "let the one who wishes take the water of life without cost".

To me the first one seems to say many are going to try to get into heaven but won't be able to, and the second says anybody who wants to get into heaven can... So either there's a difference between "trying to enter the door" and "wishing to take the water of life", or there is a discrepancy here in how salvation works.