Unclose Your Frozen Mailbox
This anecdote was reported on a discussion group for fellow Alaskans by someone who had recently arrived in the state and had experienced a frozen mailbox. “I called our Post Office to inquire how to unlock my frozen mailbox, and she told me to put WD-40 on the key and in the keyhole, then beat the mailbox with a rubber mallet a few times.”
“It took a few minutes, but yay, it worked!” I was able to get my mail by opening the box.” This WD-40 technique is even recommended by postal professionals!