(a) If it is shown at the punishment phase of the trial of an offense otherwise punishable as a state jail felony, felony of the third degree, or felony of the second degree under Section 481.112, 481.1121, 481.1123, 481.113, 481.114, 481.120, or 481.122 that the defendant used or attempted to use a child younger than 18 years of age to commit or assist in the commission of the offense, the punishment is increased by one degree, unless the defendant used or threatened to use force against the child or another to gain the child's assistance, in which event the punishment for the offense is a felony of the first degree.
(b) Notwithstanding Article 42.08, Code of Criminal Procedure, if punishment for a defendant is increased under this section, the court may not order the sentence for the offense to run concurrently with any other sentence the court imposes on the defendant.