How to unpublish a document using REST API?

Hello all,
I tried many ways to unpublish a document but seems it not work.
I update a document with the body
http://localhost:1337/api/apps/[:documentId]
{
“data”: {
“publishedAt”: null
}
}
Could you please support to point out which is the correct way to unpublish a document?
ps: I’m using strapi 5 and already enabled draft & published


Thank you so much!