Final answer:
Yes, you would likely find a keycard reader at a PSL door, as it's a common component of secure entrance systems, assuming PSL implies a type of security level that involves access control.
Step-by-step explanation:
When dealing with security systems in buildings, a keycard is a common security measure used to control and monitor access points. If the abbreviation PSL stands for "Proximity Security Level", which is not a standard term but could imply a system that reads credentials from a distance, you would indeed expect to find a keycard reader at a PSL door. These readers are electronic devices that read data stored on a card's magnetic stripe or an embedded chip; only when the correct card is presented will the door unlock, providing a secure method to regulate who can enter certain areas.