You shoplifted a candy bar your penance is to say three Our Fathers. You killed your baby say three Our Fathers.
Penance should be ‘work’. Change the Our Father to the 2000 year old version, Pater Noster ... Make the sinner learn the dead language.
Don't you know anything about temporal punishments due to sin? Do you even know what a temporal punishment is? Why don't you at least try to learn something about it, before you venture an opinion?