What does Leviticus 5:24 mean?

or anything else they lied about. They must pay back the full amount, plus add a fifth more. They have to give it back to the person they wronged on the same day they bring their guilt offering. Leviticus 5:24 - Modern Text Bible

(Restitution isn’t just returning what was taken—it also means adding 20% as a penalty, and it must be done at the same time as the offering for forgiveness.)