Police in Waukesha, Wis., report a would-be bandit arrived at the Guardian Credit Union six minutes after closing.
Security video shows a man wearing a ski mask entering the first set of doors.
But the man, who was carrying a gun, couldn't get through a second set of locked doors.
Bank employees called police, but the frustrated crook had already taken off by the time officers arrived.
Investigators are reviewing the security tape trying to I-D the man.
