The owner shall provide, install and maintain locks so that:
(A) Every dwelling unit shall be capable of being secured against unlawful entry.(B) Every door of a dwelling unit shall be capable of being secured from unlawful entry.(C) The main entry door of a dwelling containing more than three dwelling units shall be so designed or equipped so as to close and lock automatically with a lock, including a lock with an electrically-operated striker mechanism, a self-closing door and associated equipment. Every door of the main common entryway and every exterior door into said dwelling, other than the door of such main common entryway which is equipped as provided in the preceding sentence shall be equipped with an operating lock. (M.G.L. c. 143, § 3R.)(D) Every entry door of a dwelling unit or rooming unit shall be capable of being secured from unlawful entry.(E) Every openable exterior window shall be capable of being secured.(F) Locking devices shall comply with the requirements of 780 CMR 1017.4.1 to avoid entrapment in the building.