The update_expiration_for_hit
operation allows you update the expiration time of a HIT. If you update it to a time in the past, the HIT will be immediately expired.
See https://www.paws-r-sdk.com/docs/mturk_update_expiration_for_hit/ for full documentation.
mturk_update_expiration_for_hit(HITId, ExpireAt)
[required] The HIT to update.
[required] The date and time at which you want the HIT to expire