Some schools in the United States have been reported to have abolished the use of lockers. Security concerns are cited as the reason for this, with the concern being that lockers may be used to store contraband items such as weapons or drugs or pornographic material. There has been some controversy over in what circumstances school authorities or law-enforcement officials are permitted to search lockers, with or without informing the users, or with or without the users being present at the time of the search, and it has been considered a civil liberties issue, particularly in the U.S.
Terry, there are many storage unit places closer to the airport, but then of course you'd have to rent a car. DIA Self Storage, for example, is less than 10 miles away. You can google map Denver International Airport, then "search nearby" for "self storage units" if you think that's something you might want to do. http://www.coloradoselfstorage.com/
Salsbury Industries carries a complete line of metal lockers that are designed for heavy duty use and storage. Metal lockers are constructed of 16 gauge steel and are available in single tier, double tier, triple tier, six tier box style, box style bridge, extra wide single tier, extra wide double tier and extra wide triple tier lockers. Metal lockers are available as Standard Metal Lockers, Extra Wide Standard Metal Lockers, Vented Metal Lockers, Extra Wide Vented Metal Lockers and in a variety of additional products.