That scene is hate route specific and not tied to buying lockpicks. I think they should implement it into both routes in the future though.
Personally I think it's "meh" that you need to focus on 2 extremes, or full love, or full hatred. I like the concept of corrupting and dominating the girls, but I'm not fond of actual hatred. Basicly the game is divided between love and hatred, but would be nice to have lust as well.
Sure some vanilla is nice, but due the concept of the game, the more girls are added, the more repetitive will feel. I like when I corrupt the girls to actually submit to my masculinity, and not because they fear me. I'm not expecting the game to change completly to simply please my tastes, and patrons are the ones who decide it, but with the variables already in game I don't understand why a middle ground isn't explored as well. I dunno, if feels like a lost oportunity to grab another balance.
Of course this is personal taste, but male domination, rough sex, grab hair, etc, I like if well written, but stuff like spitting, make them cry, etc, is a bit too much for me. Which is sad, because the corruption dynamic of the game is well applied. But if in the end the goal is to make the girls submit as it was on the opening dream (the Hinata one), then I'll start to fall off from this game. But again, I understand it's personal preference.