S.H.
I would get a Nanny, that is what my cousin does for his 2 kids, for those reasons & parameters as well.
Through your local Mommy groups or clubs, ask around, or ask your Pediatrician if they know of any.
ALWAYS background check them. Always.
Or, if you have family in town, ask them, and sure, offer them a monetary amount, to be fair. Also, "retired" women are sometimes open to that as well. Or, perhaps a neighbor that you trust (and background check just in case).
Or, another Mom that you know from your son's daycare can care for him for that short period? (background check them too).
Also important, is you want to be sure they know first-aid, and CPR, etc. and IF they are going to transport your child... make sure they are insured etc. And have something they sign....you want to make sure you also fill-out appropriate paper-work to cover all bases. AND, you'll need to make sure that the person who will be picking up your child, has a car seat in their car as well, that you provide.
Good luck,
Susan