Or send them the name and password (non-lobby games still have those, viewable on party screen).
The only time you truly lock yourself in alone is if you set max players to 1. But even then, you could still give someone the name/pass, leave and have them clear it up for ya. Game stays open for quite a while after leaving, so long as you don't make or join a different one.
List trades and earn trust
Level up as you post
Give and Receive Likes
Discreet Notifications
Avatar & Profile customisation
Private Messaging
Bookmark Pages & Posts
Use Drafts & Revisions
Attach Images
Squelches this trader, making their offers on your trades invisible to anyone except themselves. Their trade listings will also be hidden from your marketplace.
Your squelch list can be managed and edited from Top right dropdown > Account Prefs > Squelches.
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