Recently completed my work permit and booked a ticket to fly back to my country. Given COV-19 quarantine and potential lock-down, I may have to overstay my grace period. Will this cause potential problems if I want to return to the US down the line? Is it work the risk or should I plan to reschedule my flight to an earlier date?
Yes, overstay will cause problems in the future.
You might be banned from entering the U.S., have problems with obtaining nonimmigrant/immigrant visas.
Here's more on immigration violations: https://selflawyercom.wpcomstaging.com/immigration-violations-illegal-entry-visa-overstay-and-unauthorized-employment
It may be best to file a B change of status in light of COVID-19.
Try not to overstay even by one single day. Book an earlier flight if you can.
Yes, it will affect your ability to return to the US. To be absolutely safe, do not overstay your visa. Book an earlier flight if you have to.
It most definitely will affect your return to the U.S. unless you extend your status.