locked myself out after picking up the keys to my old flat on the way to buy breakfast stuff

left my phone and stuff inside the house, now hiding in the uni library with a box of krave and grapefruit juice, no reply on the buzzer from my other flatmate etc. emailed my landlord from here hoping to get hold of an email address for the other person

pretty close to having a panic attack tbh, this has never happened before and i'm not sure what to do (and had a bunch of things i needed to do this morning)

HELP