How to say: the buttons are old, press hard

Question

The door code buttons in our building are very old and malfunctioning. Sometimes I don't get my deliveries because the person thinks the password is wrong and just leaves.

I wanna add a note to my orders like: the door code buttons are old, please press hard.

Answer 1

I'd write "Ovikoodin näppäimet ovat vanhat, joten paina kovaa."
or "Ovikoodin näppäimet voivat olla jumissa, joten paina kovaa."
voivat olla jumissa = might be stuck

Answer 2

Ovisummeri on vanha. Paina lujaa!