The owner in this fact description did not follow Minnesota law. A default does not occur until one is 15 days late on rent. After this 15 days, the owner must mail you a notice giving you 10 days to pay what is due. If you still do not pay, they must then publish a notice in a local newspaper for two consecutive weeks. The sale can be held 15 days after the first publication. So, in total, 45 days must pass from the date the rent was due before the owner can conduct a sale. If they fail to do so, they are liable for conversion.
These are general statements of law and should not be taken as legal advise. You should consult a lawyer before relying on any of the statements contained herein. Nothing in these statements creates an attorney-client relationship.