The city’s schools are getting a security upgrade. The Board of Education has approved a contract to install improved locks on all classroom doors. The new “Columbine” locks are named for the school that was the site of the infamous 1999 Colorado shootings. The new locks have two keys, one for the inside and one for the outside, and allow staff to lock their classroom doors from the inside in an emergency. The locks are expected to be installed in city schools by the end of the school year at a cost of $407,262.