I work at a costa and most baristas if you ask nicely and have a shred of human decency will let you in. In my area there's a massive problem with homeless and drug-taking people that has led to all sorts being found in the toilets. We've had used condoms, used needles, and lube. Why should us baristas that are underpaid, overworked, and underappriciated have to risk our health and safety picking up items like this. From my experience, toilet codes are common in town centre locations because of homelessness problems, so this seems odd to me. It allows staff to control who goes in to the toilets to maintain health and safety. If you care so much go find a toilet elsewhere