No. Requirement for secure storage means a door with a lock. Safe not required. There was a time when groups were stealing a large truck (think 5 ton truck) and running it backwards thru the wall of a gun shop, grab what they could, and haul out before anyone could respond.
Had a friend that was setting up a shop, only exterior wall that could be attacked that way was the front- fair bit of glass, hollow block wall.
We found some concrete planters- about 6 ft long, 2 ft wide, 3 feet high. Set 4 of those out front, 8 feet from shop front. No bottoms. Before filling with potting soil and putting flowers in them, we drove 7 ft lengths of railroad rail 4 feet into the ground INSIDE of the planters. 3 per planter.
Try ramming THAT with a truck.