Calling a plumber can be expensive. Especially when you have something as simple as a clogged sink and it's going to take them all of 10 minutes to finish the job. Instead, you can use zip ties to create a simple drain cleaner. Cut slits at the end of the zip tie to help catch whatever might be clogging the drain and use it to fish out whatever is causing the issue.
It's a better alternative to using harsh chemicals and a much cheaper alternative to calling a dedicated plumber. You'll save some money and time with this simple hack.