How about if I chose to get it delivered to a locker inside my local supermarket, then complained that I had to queue up with everyone else to get in to access it? Or chose to get it delivered to a shop, then complained that they expect me to show up only within their opening hours to collect MY property? Surely this is no different - I chose to get it delivered there, so should expect to have to abide by the rules of said premises?
A locker at a station is clearly intended for people who are using the train, I guess most common examples being people who have been out for work or leisure for the day and can collect their parcel on the way home. There are Amazon counters in several shops opposite, and another locker around the corner!