Reaction of 2-ethyl-5-methyl-3-phenylfuran under acidic conditions I was asked:


  
  Does protonation occur to the electronegative oxygen?
  What is the function of the heat?
  


I think that there will be protonation at C-3 which will break the aromaticity and the ring will open to form a diketone product.
Your answer looks perfectly reasonable. Acid hydrolysis of furans is a well established route to 1,4 diketones. The heat is required to overcome the resonance stabilisation of the furan ring.