Duro proved the matchwinner against Getafe on Saturday.
On a Spain call, Baraja said: "He has good numbers, but his work does not always get the reward of a goal.
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"He is very important for the team, and today he was successful in scoring. I always demand more from him, that he doesn't settle. In football you have to keep going, work hard and insist.
"The important thing is to feel that through improvement you can become a better player than when you started the season. I hope he gets there, because it would be a sign of his work this season, which has been very good, being appreciated."