two days to make a friend is not long at all, most of the other kids will be feeling pretty weird too, it can take a good few weeks for people to feel comfortable enough to approach others in the group/class and even then they may change who they like to spend time around a few times during the year, that is all part of growing up, hey even adults sometimes feel this way too. so give it a few weeks before shutting people out, try to keep the gate unlocked as people may want to come in later. by locking the gate you could miss out on a true friendship developing.