Depending on you exact model there is a good chance the door latch motor is behind the back panel of the oven.
How to unlock a locked door on a frigidaire oven.
Wait a minute or two and then try to open it again.
Program your frigidaire oven to self clean.
You will need to hold the pad down for 3 seconds.
If you try to use your oven and find it locked press the clear or reset button to stop the oven and turn it off.
You should see a small motor with a connected rod going over the top of the oven to the front of the machine.
If it s still locked start an oven cleaning cycle.
Wait at least 20 seconds before you cancel the self clean setting on the oven.
The oven should unlock.
Unlock a frigidaire oven door by pressing the clear off button until the lock feature disengages allowing the door to be opened.
Set the oven to self clean.
Unplug the oven and remove the back panel.
If your oven door is locked open press and hold down the light switch while you continue to work through the process of cancelling the lock on the door.
Again wait for at least another 20 seconds.
Allow the cleaning cycle to run for about 60 seconds and then cancel it.