Theophylact of Ohrid

Do you see how the Jews waited and remained until the high priest came out? But we Christians, as soon as we enter the temple, already think that something bad will happen to us if we do not leave.

Commentary on Luke ↗

Ancient Greek Expositor

Now while these things were going on within, the delay excited surprise among the multitudes who were waiting without, as it follows: And the people waited for Zacharias, and marvelled that he tarried. And while various suspicions were going about, each man repeating them as it pleased him, Zacharias coming forth told by his silence what he secretly endured. Hence it follows, And when he came out, he could not speak.

Catena Aurea by Aquinas ↗

Bede

And the people were waiting for Zechariah and were wondering at his delay in the temple. But when he came out, he was unable to speak to them. And they realized that he had seen a vision in the temple, and he was making signs to them and remained mute. And it happened that when the days of his service were completed, he went home. This is what I said: that during their turn of duty, priests, being engaged solely in the temple's duties, not only refrained from the embrace of their wives but also from entering their own homes. …

On the Gospel of Luke ↗

Bonaventure

And the people were, etc. Here is touched upon fourthly the evidence of the sign on account of the presence of the multitude and the absence of speech. He touches upon the presence of the multitude waiting and wondering, saying: And the people were waiting for Zechariah, and they wondered that he tarried in the temple. …

Commentary on Luke, Chapter 1 ↗