All doors should be locked when no one is in the lab or office. Also be alert if a stranger pops into your lab. Ask what he/she wants. You should contact security at extension 2365 if you are unsure what the person wants.
All corridor doors should be locked after office-hours. When you enter/exit a corridor, make sure that you have locked the door after you.
The roll call form listing the persons authorized to work in your lab should be updated regularly whenever there is a change.