TIFU by leaving my friend locked in a room.

The title is pretty self explicatory. In the college I study there's a student's association named Delegación de Estudiantes. If you are part of the group, you can use the private room they have. We pretty much use it to study, help other students or eat lunch, nothing else. We have a small couch in case anybody wants to rest for a bit. Another thing to keep in mind is that the college I study at closes at 9 pm.

Yesterday there were only three of us. Me (19M), my friend Oscar (19M) and my other friend Maria (19F). W e were studying there and Oscar fell asleep on the couch somewhere around 6 pm. He was having a rough day and hadn't slept all that well that day. Maria and I intended to leave somewhere around 7pm, and she wnated to wake him up before we left so he also left with us. I told her that we should just let him sleep a bit more, there are two avaliable set of keys to enter the room and the both of us (Oscar and I) have access to them.

She begrudgingly agreed, so at 7pm I left a key inside, so that he could get out once he woke up and nobody tried to steal his things (The room has a glass wall, so people can see everything from outside), turned of the lights, closed the window just in case anybody tried to get in and sent him a message telling him what I did. I just wanted him to rest, I knew other people from the association did the same, so I thought I was helping him.

Maria and I both went to our separate homes, and I fell shortly asleep, it wasn't exactly the best of days. I sent some messages to oscar and called him to see if he was okay, I had no answer so I fell asleep. I woke up around 2 am, saw that both of them had written me. She tod me that I scared the living shit out of him, that he was incredibly angry and that we had to talk seriously on Monday. He just wrote me "Don't you dare do that to me again.".

I wrote both of them that I genuinly didn't mean to either scare or harm him, just wanted to help, and that I understood if they wanted to rethink their relstion towards me. He wrote me 5 mins after that it wasn't that big a deal, but I know I fucked up greatly and he's angry at me. Maria also wrote back today, saying that I'm dumbass, should've listened to her and that I made a mistake but wouldn't stop being friends with me, but that on Monday we would talk. I don't know what to do know. I know that trying to contact them now won't do anything, seeing that she's ignoring the few messages I sent her. I'd appreciate some advice. I know I fuck up. I just want to fix things.

TL;DR: I fucked up by leaving my friend locked in a room sleeping when I should've just woken him up before we left.