How to convert a dictionary into a list of its keys sorted by its values?

I want to get a list of keys sorted by its values and in case of any ties, sorted alphabetically. I'm able to sort by values. In case of ties, I'm facing issues.

for dictionary:

aDict = {'a':8, 'one' : 1, 'two' : 1, 'three':2, 'c':6,'four':2,'five':1}

I've tried this:

sorted(aDict, key=aDict.get, reverse=True)

which gives me:

['a', 'c', 'three', 'four', 'two', 'five', 'one']

but I want:

['a', 'c', 'four', 'three', 'five', 'one', 'two']