In the evening the prophet was to return to the wall, break through it, and transport the goods from the inside to the outside of the city.
Matthew Henry
Concise Bible Commentary
By the preparation for removal, and his breaking through the wall of his house at evening, as one desirous to escape from the enemy, the prophet signified the conduct and fate of Zedekiah. When God has delivered us, we must glorify him and edify others, by acknowledging our sins. Those who by afflictions are brought to this, are made to know that God is the Lord, and may help to bring others to know him.
SDA Bible Commentary (limited)
Volume 1-7
7. I did so. Ezekiel may have performed the symbolical act without fully understanding what it meant. The fact that the exiles asked him, “What doest thou?” (v.9) is evidence that the symbolical act was actually performed, and not done in vision.