I could not be more lost (rotation script)

I am trying to make a script that would rotate a cylinder on button push but still restrict movement. I basically want it to move from 0 to 90 degrees freely but stop it from moving any farther.

The real problem is i am trying to do the exact same thing with another cylinder with different keys in a different direction(270 - 360).

Oh, the problems I've had. I have tried so many things to fix my problem, i don't even no what problem is what anymore.

so after 2 hours of sheer frustration i decided to ask for some help.

 if(direction == 1){//dont worry about this
         if((Input.GetKey(keys[0])||Input.GetKey(keys[2]) &&   transform.rotation.eulerAngles.x < 340)){// if figure that restraining it a 340(close enough to 360)
 // will stop it from annoyingly switching back over to zero rotation

         
             transform.Rotate(4,0,0);
     
         }    
     
         if( (Input.GetKey(keys[1]) ||Input.GetKey(keys[3])) && transform.rotation.eulerAngles.x > 270){
     //by the way keys[] is an array that holds string values, that all works great
         transform.Rotate(-4,0,0);
         }
         }else{
 //again don't worry about the else, t just separates the cylinders from each other, so i know which way to move it
         if((Input.GetKey(keys[0])||Input.GetKey(keys[2]) )&& transform.rotation.eulerAngles.x < 90){// this would be the other cylinder
         
             transform.Rotate(4,0,0);
     
         }    
     
         if( (Input.GetKey(keys[1]) ||Input.GetKey(keys[3]))  &&transform.rotation.eulerAngles.x >5 ){
     
         transform.Rotate(-4,0,0);
         }        
         
         
         }

Just incase i forgot to mention, the problem is that the cylinder fails to stop moving. thank you for your time

have a Quishtay™ Day