Toggles the call’s locked state. While locked, the server rejects new join requests; participants already on the call are unaffected. Useful for closing the door on a meeting once everyone expected has arrived.
The current state is reflected by locked$. Requires the lock capability — inspect call.capabilities$ before exposing the control in your UI.
Promise<void> — resolves once the server has acknowledged the state change.
locked$ — observable of the current lock state.