curl -i -X POST "https://api.box.com/2.0/folder_locks" \
     -H "authorization: Bearer <ACCESS_TOKEN>" \
     -H "content-type: application/json" \
     -d '{
       "folder": {
         "type": "folder",
         "id": "33552487093"
       },
       "locked_operations": {
         "move": true,
         "delete": true
       }
     }'

{
  "folder": {
    "id": "12345",
    "type": "folder",
    "etag": "1",
    "sequence_id": "3",
    "name": "Contracts"
  },
  "id": "12345678",
  "type": "folder_lock",
  "created_by": {
    "id": "11446498",
    "type": "user"
  },
  "created_at": "2020-09-14T23:12:53Z",
  "locked_operations": {
    "move": true,
    "delete": true
  },
  "lock_type": "freeze"
}