I am often asked this question by parents concerned that they might take the joy out of music by demanding a minimum amount of practice each day.
My answer in short:
Yes, just as you would force your child to do their homework. A sure way to 'take the joy out of music' is feeling stupid because they lack proficiency on their instrument.
Keep this motto in mind: "First discipline, then comes the freedom and joy of proficiency." This applies to just about everything in life.
I've become troubled in the last few years about pop culture displayed by TV programs like, "American Idol" and movies like Disney's "Lemonade Mouth".
These programs drive me crazy as a music teacher because it gives kids and also the parents the idea that anyone can just play and sing at a high level without practice. In reality, top American Idol contestants are usually already professionals and have been studying their art intensely since they were knee high. Movie plots have been based on this fantasy since Judy Garland and Micky Rooney made several movies with similar plots: two kids up and deciding to put on a musical show out of the clear blue sky and somehow performing at a professional level!