Translation:Open the door for me, I forgot my key.
though not a native speaker of English, I am convinced that this translation, which I just wrote myself, is not "wrong". What is more, I understand that while with terms such as папа, мама, брат etc. the possessive pronoun is frequently omitted if the reationship is evident from the context, the case is completely different with "key". Who says that it is "my" key which I forgot - it can also be a key lent to me by the host or whoever ...
"I forgot the key" is more direct. I have no idea where this "my" is coming from.
Since crown levels whole Russian course is more like a course of anger management. The moderation team doesn't give a single ❤❤❤❤ about it. There are sometimes 16 out of 18 exercises wrong in one lesson. But it's not stopping them from asking for money.