WJBK-TV reported the post office in Willis about 28 miles southwest of Detroit was closed Thursday evening when the woman stopped by but the post office box area was open. After she went inside to get her mail, she couldn't get out.

Another woman saw her when she was mailing letters and called 911.

Postal Service spokeswoman Shannon LaBruyere said something in the mechanical mechanism on the door prevented it from opening. LaBruyere said the woman was understanding about the "unfortunate fluke."