alternator

had driver rear caliper changed...30 mins later... brake light and battery light came on.. may be a alternator issues...but i want to know if it can be another issue other than that before i get new alternator.. trouble shooting and going thru process of illumination

The alternator broke on my 2008 Murano and to top if off, the keys are now lost. We think the keys are inside the Murano but I am unsure and trying to avoid paying for a locksmith. Any ideas on how to access the Engine or Murano without the key? Thank you!