Jesus, as our shepherd, was similar to any other shepherd boy in any village. Every family kept sheep for meat and wool. As well. every family had a shepherd boy who grew up with the family's little flock.
The boy would lead his family's sheep up into the hills for grass. Then, at evening he would lead them back to the village sheepfold. The village shepherd boys would take turns sitting in the gate while his companions went to eat with their families. There, his flock would sleep separately until morning.
At morning, each shepherd boy would in turn arrive at the gate to the sheepfold. There he would make a sound familiar only to his own flock; and they would rise up, while the other little flocks slept on. Jesus, like each shepherd, knows his own sheep intimately; and they know him.