Just take their money and drop them back on the shore they came from. See how long they want to keep coming.
This is Ceuta, an exclave. They didn't arrive on any shore. And often migrants who arrived by sea already paid all their money to smugglers and don't have lots of money to confiscate.
They did arrive by shore, a lot swam there.
They did not pay all their money to smugglers either, they were complaining about the food prices.