I've had springtails in all of my tanks and have never seen any come near to getting out even on tanks with obvious points of escape. Like the others said, even if they did get out, you'd never notice.
I rarely see springs out in the open near vents, but it's fun to follow those squiggly lines through the glass condensation to find mites wandering around. They go in and out through any and all holes.
Springtails can and will go anywhere in the viv that they wish to go. Most springtails require high humidity to survive. Therefore, there is little draw for them to leave their humid vivarium. If you have been in the hobby any length of time, it becomes obvious that springtails can manage to get into other tanks and cultures, so obviously some can and do get out and move into the viv next to them. That, however, is a short trip through a dry environment.
Escapees would never survive your homes environment for any length of time. I doubt they could survive an hour or two.