http://www.nyc.com/yellow_pages/schwartz_travel_services.988654/editorial_review.aspx
http://www.nyc.com/yellow_pages/schwartz_travel_services.988654/editorial_review.aspx
The first links discusses what to do.
The 2nd is for Schwarz travel. I have never used them but looks like what you may want
Same link was posted twice, but the above business sounds like your best and possibly only option.
While lockers were already becoming scarce b/c of other nefarious usues, after 9/11, homeland security has made them extinct.