In the Vulgata, Mark 6:3 reads:
Nonne hic est faber, filius Mariæ, frater Jacobi, et Joseph, et Judæ, et Simonis? nonne et sorores ejus hic nobiscum sunt? Et scandalizabantur in illo.
The first verse is usually translated as:
Isn't this the carpenter?
Similarly, in Mark 13:55 we read:
Nonne hic est fabri filius? nonne mater ejus dicitur Maria, et fratres ejus, Jacobus, et Joseph, et Simon, et Judas?
The first phrase is commonly translated as:
Isn't this the carpenter's son?
In effect, the Catholic tradition interprets the profession of Jesus' putative father, Joseph, as carpenter. As the respective entry in the Catholic Encyclopedia states;
St. Joseph, indeed, was a tekton, as we learn from Matthew 13:55, and Mark 6:3. The word means both mechanic in general and carpenter in particular; St. Justin vouches for the latter sense (Dialogue with Trypho 88), and tradition has accepted this interpretation, which is followed in the English Bible.
There is also reference to Joseph's profession is several apocrypha. For instance, the "Story of Joseph the Carpenter" states:
He was, besides, skilful in his trade, which was that of a carpenter
The Catechism of the Catholic Church, in numeral 2427, when referring to the dignity of work, states:
Human work proceeds directly from persons created in the image of God and called to prolong the work of creation by subduing the earth, both with and for one another. Hence work is a duty: "If any one will not work, let him not eat." Work honors the Creator's gifts and the talents received from him. It can also be redemptive. By enduring the hardship of work in union with Jesus, the carpenter of Nazareth and the one crucified on Calvary, man collaborates in a certain fashion with the Son of God in his redemptive work.
Finally, Pope Francis, in his apostolic exhortation Amoris Laetitia states:
We then need to peer
into those thirty long years when Jesus earned his
keep by the work of his hands
To conclude, the Catholic Church believes Jesus did work for a living during part of his private life, probably as a carpenter. It might not be unreasonable to assume Jesus learnt this trade from Joseph.