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MasterOfNone wrote:

bkj wrote:30.06 does not apply to your employer.

GC CH. 411. DEPARTMENT OF PUBLIC SAFETY OF THE STATE
OF TEXAS
Subch. H. LICENSE TO CARRY A CONCEALED HANDGUN

GC §411.203. RIGHTS OF EMPLOYERS. This subchapter does not
prevent or otherwise limit the right of a public or private employer to
prohibit persons who are licensed under this subchapter from carrying
a concealed handgun on the premises of the business.

30.06 does not apply to your employer. If you are informed in any manner by your employer that firearms are not allowed you can be charged under 30.05.
PC §30.05. CRIMINAL TRESPASS

(3) a Class A misdemeanor if:
(A) the offense is committed:
(i) in a habitation or a shelter center;
(ii) on a Superfund site; or
(iii) on or in a critical infrastructure facility; or
(B) the person carries a deadly weapon during the commission
of the offense.

You left out 30.05(f), which provides a defense if the prohibition you violated is for handguns:

(f) It is a defense to prosecution under this section that:
(1) the basis on which entry on the property or land or in the building was forbidden is that entry with a handgun was forbidden; and
(2) the person was carrying a concealed handgun and a license issued under Subchapter H, Chapter 411, Government Code, to carry a concealed handgun of the same category the person was carrying.