There are a number of choices between locker opening systems. The most suitable opening method depends on the situation.
Push to open
With Push to open the locker will open as soon as you press the door. The door will open partially. If the door is not fully opened, it will be locked again after some time has passed.
If the locker is opened using the pop open function the door will open partially. There is no need to press on the door.
Pull to open
With Pull to open the door is unlocked, after which it can be opened with the door knob. If the locker is not fully opened, it will be locked again after some time has passed.