Jack is a $17-$year$-$old and is a student at Deakin College. Jack was offered an internship to get $6$ months work experience at a local accountancy firm $($Smart Accounting$)$ while completing his studies. The internship will provide Jack with the opportunity to engage with clients and prepare accounts under supervision. Recruiters highly recommend this kind of experience. The internship contract contains a term in the contract, which says that Jack must work from $9$am until $5$pm$.$ Jack decides to sign the internship agreement which states Jack must give one week's notice if he wants to quit. After $2$ days Jack misses playing online games and sleeping in until his parents wake him for lunch. Jack wants to stop working today and not give any notice to Smart Accounting.

Jack seeks your advice as to the following:

$1.$ Can this contract be legally enforceable against Jack since he is a minor?