Update Locks on Tickets/Tasks

I am a huge fan of being able to see who is viewing/editing/updating a ticket. This feature is great when I remember to look at this. Is there a way to "lock" the ticket during updates, so that no other users can edit/update the ticket? I have had instances of double work occurring and I believe a setting for "locking" a ticket would be effective.

Or is the best practice to use the "My Work" applications to "hide" the ticket from others so then this occurrence is less likely?