Really even then you can still stick to the shell, it's just a little trickier . . .

$ /bin/ls foo-*.txt | sort -n -t - +1 -2
foo-1.txt
foo-2.txt
foo-3.txt
foo-4.txt
foo-5.txt
foo-6.txt
foo-7.txt
foo-8.txt
foo-9.txt
foo-10.txt
foo-11.txt
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