So I recently lost the key to my front door. I contacted my landlord, who told me he only had a master key, no spare keys. He suggested that I have my roommate, who was out of town for several weeks traveling for work, send me her key and I could go to a locksmith and replace it. I didn’t do this, I guess because I’m lazy, and also because I wanted to be able to lock my door when I went to work that week. Instead, I contacted a locksmith, had him come to my apartment, I asked him to just replace the key, that I didn’t need a new lock. It was probably just a miscommunication, but the locksmith replaced the entire lock, I didn’t realize the until my roommate returned and her old key didn’t work. I contacted my landlord again and told him about what happened, and he told me to have the locksmith come back to my apartment, he’d meet us there, and have the locksmith “match the lock/ rekey the lock, to his master key”. I know this is super long winded, but is this even possible? I have no clue what a master key is, and I have no idea how I’d go about explaining what I need to the locksmith. If anyone could clarify this for me, that’d be really great! Thank you!