Most of us who have chametz we don't wish to destroy (or consume) before Pesach sell it to a non-Jew; after Pesach, he usually will sell it back to us instead of settling in cash.
It's well known from the rules of the arbaa minim (lulav et al. that we use on Sukos) that a minor cannot transfer property. (This comes up on the first day of Sukos, when the one using the arbaa minim must own them in order to do the mitzva. An adult can't give the minim to a minor to own and expect them back, since a minor can't give anything away.)
What, then, can a minor who owns chametz do before Pesach, if he doesn't want to consume or destroy it? That is, what advice have rabbis given over the years, or what have such minors done over the years? And what does such a minor do, in practice, today? I'd even be interested in theoretical answers — what such a minor could do — if well-reasoned or, especially, sourced.