contained thereon application_number US 94127101 A description in the prior art shown in fig1 and 2 a door 1 locks into a doorjamb 2 by a sliding bolt 3 that extends into an opening not shown in the doorjamb 2 the sliding bolt 3 is slidably attached to the door 1 by a door plate 4 which is secured to the door 1 by back plate 5 and held together by bolts 6 a 6 b 7 a and 7 b threadably connecting into spacers 8 a and 8 b respectively the spacers 8 a and 8 b provide the separation space needed for movement of the sliding bolt 3 back plate 5 is inside the door 1 and door plate 4 is outside the door 1 a recessed lock 9 by extending through aligned holes locks the sliding bolt 3 in the extended position however when the door 1 is locked and the sliding bolt 3 locked into its extended position in the doorjamb 2 the door 1 and doorjamb 2 may be easily pried apart by a crowbar or similar prying device referring to fig3 and 4 a storage unit door 10 made of corrugated metal is shown in a closed position such that the right vertical edge of the storage unit door 10 is adjacent a doorjamb 12 a locking mechanism 14 is mounted to the storage unit door 10 the locking mechanism 14 is equipped with a door plate 16 an extension plate 18 a bolt 20 a bolt handle 22 a protecting flange 23 an.