You should knock before you enter someone else's room.
It is early morning and Jane staying in a guest room at a friend's house she is visiting.
Jane wants to see what her friend.
Jane walks down the hall to her friend's room and knocks on the door, calling out her friend's name.
Jane walks down the hall to her friend's room and opens the door to see what they are doing.
Her friend avoids an awkward situation by letting Jane know that she is currently getting dressed and that she will meet her in the kitchen in a few moments.
Jane walks in on the friend getting dressed and the friend is embarrassed to be seen in the compromising situation.