Stop Quickstart worker

I start the worker with:
zbctl create worker test-worker --handler "echo {\"return\":\"Pong\"}"
but how can I stop the worker?

Ctrl-C.

and if I use
zbctl create worker test-worker --handler "echo {\"return\":\"Pong\"}" &

ps -fe |grep zbctl
kill process :sweat_smile:

fg and then CRTL + C