That is what a parable is using something known/understood to clarify/explain something not known or understood. Saying somewhere in Matt ch. 5 Jesus says something about hell does not tell me anything. Please quote scripture so I can discuss it.
I agree Matt 21:33-41 is not simply a story about a landowner and his vineyard. But every detail of the parable is not exactly like the kingdom of God point Jesus is explaining.
Here is a couple of vss, from Matt 5
Matthew 5:39-42
(39) But I say unto you, That ye resist not evil: but whosoever shall smite thee on thy right cheek, turn to him the other also.
(40) And if any man will sue thee at the law, and take away thy coat, let him have thy cloke also.
(41) And whosoever shall compel thee to go a mile, go with him twain.
(42) Give to him that asketh thee, and from him that would borrow of thee turn not thou away.
None of this is going to be happening in heaven or hell.
39 Nobody is going to be smiting anybody on the cheek in heaven or hell
40 Nobody is going to be suing anybody at law in heaven or hell
41 Nobody is going to be compelling anyone to go a mile in heaven or hell.
42 Nobody is going to be borrowing anything from anybody in heaven or hell.
Jesus is giving guidance how His followers should behave here in this world.
In another discourse there was something about paying the last penny. There will be no pennies to pay in either heaven or hell. Nobody will be buying their way out of either one.