Mass Effect 1 (PS 3)

My problem is getting storage lockers and other items.  I keep getting Decryption Skill is too low, however, as a soldier I don't have any decrypt skills.  If I try to use Tali's decrypt skills, she only send a disc like item into the wall or floor, never at the locker.  The only other way I have to open these items is to sell off armour and weapons for omni-get, however, this really makes Shepard very weak in both areas.

If I am able to use my squad members to decrypt items, I would appreciate any advice on how to use the controls and in which order.  Any assistance would be greatly appreciated.

Thank you for your time,

Jeff.