How can tasks be processed sequentially by key?

Question

RabbitMQ

There are producers who add tasks with different keys to the queue (some tasks may have the same keys).
There are consumers (some set) that take tasks from the queue and process them.
Task:
How can you make tasks with the same key processed sequentially, i.e. one by one?
There may be tens of thousands of keys.
How can this task be done with rabbitmq/kafka? Perhaps there are some better alternatives.