The door lock assembly for most models of Frigidaire ovens is described in the first image below. With the latch arm sticking out, you may not be able to operate the oven until the latch assembly is repaired.
You can try holding in the light switch for the oven and starting a self clean cycle to reset the lock mechanism. If the self clean cycle can be started, the oven will lock the door as the first step. You would need to continue to hold the light switch in during this process. After the locking process is complete, continue to hold the light switch and cancel the self clean cycle. The door lock may reset to its normal position.
If the door lock mechanism will not reset (or the control will not allow you to program the self clean cycle), then you will need to repair the door lock assembly. A technician is normally needed for this repair procedure.
If you have the technical ability to safely access the lock assembly and want to attempt this repair yourself, resubmit your question with the full model number of your oven for more technical help if needed.