I need to know if there is any manual way to set expiration date for a given role.

In my website, when a person purchases a video, he is assigned a role. What I am looking for is to restrict this role to 30 days. Meaning that this person has access for this restricted content during 30 days, after that, he will get back to “subscriber” with no further access to the video he purchased.

Thank you and regards

Liliana
Kindly let me know if I can do this manually. I am currently using a plugin.