What do you mean by “a must read”?
To me, that phrase itself sounds like a mistake.
I got a degree in Literature without ever having had to read any significant amount of Kafka.
But Kafka is a great author and well worth reading.
He had great perception (at the start of the 20th Century) into the cultural conflicts between people as humans versus the inhuman forces of our societies, ways of thinking, laws and conventions.
I’d say that’s as relevant as ever, and the contrast seen from an early-20th-Century brilliant Czech author would tend to be useful.