they would n't budge , he said .
police say a 16 - year - old , of detroit , entered chase bank located on seven mile on detroit 's east side about 2:30 p.m. monday .
the teller engaged what is called a " man - trap , " basically a security system that locks would - be intruders between the two sets of doors leading outside where they remain caged until police can arrive and take them safely into custody , which detroit police soon did .
detroit teen was detained by police monday .
it 's unclear if the teen had a weapon , donakowski said , adding that he believed the teen only had a note in his possession .
he opened the first set of doors into the causeway .
the teen set off for the doorway , likely exhilarated by the scent of escaping with his new wealth .