HELP! my alt key is stuck, pressed, but not (Not physically)

[felipemullerfilmes]

I have a macbook pro 13 (mid 2012)
my alt key is stuck, pressed, but not.
When I type, symbols appear instead of letters, as if pressed.

The mac already connects directly to selecting discs, as if pressing alt.

 

[SGilbert]

Have you tried compressed air can?

 

[chevy]

If you need to go further you can try this:

(Make sure you see the full videos with the warnings at the end before you try)

 

[felipemullerfilmes]

Resolvido! Comprei um teclado novo para o mercado aberto e fiz a troca em casa.

 

[Cheryl]

translation: "Sorted out! I bought a new keyboard for the open market and made the exchange at home."