如何在spring boot中手动使JWT令牌过期？

import io.jsonwebtoken.Claims;
import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.SignatureAlgorithm;

import java.util.Date;

public class JwtUtil {
    private static final String SECRET_KEY = "your-secret-key";
    private static final long EXPIRATION_TIME = 3600000; // 1 hour

    public static String generateToken(String username) {
        Date now = new Date();
        Date expiration = new Date(now.getTime() + EXPIRATION_TIME);

        return Jwts.builder()
                .setSubject(username)
                .setIssuedAt(now)
                .setExpiration(expiration)
                .signWith(SignatureAlgorithm.HS256, SECRET_KEY)
                .compact();
    }

    public static boolean validateToken(String token) {
        try {
            Claims claims = Jwts.parser()
                    .setSigningKey(SECRET_KEY)
                    .parseClaimsJws(token)
                    .getBody();

            Date expiration = claims.getExpiration();
            return !expiration.before(new Date());
        } catch (Exception e) {
            return false;
        }
    }
}