Don't wanna come off as brash or anything, but if someone can't deal with a simple locker tech, then I'm gonna be honest and go ahead and say it's a major skill issue. It's nothing hard to counter or even use, it's just something that's uncommon(very surprisingly imo). And if for whatever reason if even average or above average players are having issues defeating locker abusers, maybe we shoud look at what people are abusing lockers with and nerf those, such as 357's and ebows, which in my opinion are extremely strong given their tc costs.
Additionally, it should just cement that security shouldn't expect to defeat a same-skilled antag alone. They should refer to using group tactics and communcation skills with other security officers. And if used correctly, would prevent lockers from being an issue to begin with.