How does Ruth teach Jan in a lesson?(Chapter 10)

Ivan reaches to give them more chocolate, but sees that the scoundrel Jan has already picked his pocket. He also hands Jan a new box with his name on it. Jan refuses to say thank you, but Ruth forces him to. She will also not let him have shoes until he apologies. This takes a whole week, but Jan, with frozen, cut feet, finally goes to Ivan and says sorry, as he sobs. He gives Ivan a treasure from the box: a dead lizard.